Re: What I'm missing in my Instaparse rules?
Oh my ...
You saved my hair! :)
Thanks a lot for your help and time.
On Monday, June 13, 2016 at 12:03:54 PM UTC+2, puzzler wrote:
>
> Looks like you left off a + in your regular expression for String.
>
> On Mon, Jun 13, 2016 at 2:59 AM, Hussein B. <hubag...@gmail.com
> > wrote:
>
>> Thanks for your help.
>>
>> I tried this new grammar to match characters only:
>>
>> "
>>
>> TEST = OBJECT
>>
>> = <#'\\s+'>
>>
>> OBJECT = CURLY_OPEN WHITESPACE* STRING WHITESPACE* (WHITESPACE* OBJECT
>> WHITESPACE*)* CURLY_CLOSE
>>
>> = <'{'>
>>
>> = <'}'>
>>
>> STRING = #'[a-zA-Z]'
>>
>> "
>>
>>
>> (parse "{harden {James}}")
>>
>>
>> Parse error at line 1, column 3:
>>
>> {harden {James}}
>>
>> ^
>>
>> Expected one of:
>>
>> "}" (followed by end-of-string)
>>
>> "{"
>>
>> #"\s+"
>>
>> On Sunday, June 12, 2016 at 10:07:01 PM UTC+2, puzzler wrote:
>>>
>>> Regular expressions are treated with their ordinary Java/Clojure, greedy
>>> semantics.
>>>
>>> Your regular expression for ITEM doesn't exclude whitespace or }
>>> characters, so ITEM is matching "Harden }" which leaves no characters left
>>> to match your grammar's right curly brace requirement.
>>>
>>> => (re-seq #"[^\"]+" "Harden }")
>>> ("Harden }")
>>>
>>> A solution would be to make the regex for ITEM more restrictive.
>>>
>>> On Sun, Jun 12, 2016 at 12:52 PM, Hussein B. <hubag...@gmail.com> wrote:
>>>
>>>> Hello,
>>>>
>>>> I'm playing around Instaparse library, starting very simple.
>>>>
>>>> For input like :
>>>>
>>>> { player }
>>>>
>>>> I created the following parser:
>>>>
>>>> (def ast
>>>> (ist/parser
>>>> "TEST = OBJECT
>>>> = <#'\\s+'>
>>>> = <'{'>
>>>> = <'}'>
>>>> ITEM = #'[^\"]+'
>>>> OBJECT = CURLY_OPEN WHITESPACE* ITEM WHITESPACE* CURLY_CLOSE"))
>>>>
>>>>
>>>> In the REPL:
>>>>
>>>> user=> (ast "{ Harden } ")
>>>>
>>>> Parse error at line 1, column 12:
>>>>
>>>> { Harden }
>>>>
>>>>^
>>>>
>>>> Expected one of:
>>>>
>>>> "}" (followed by end-of-string)
>>>>
>>>> #"\s+"
>>>>
>>>>
>>>> Any ideas what I'm doing wrong?
>>>>
>>>> Thanks for help.
>>>>
>>>> --
>>>> You received this message because you are subscribed to the Google
>>>> Groups "Clojure" group.
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>>>>
>>>
>>> --
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>
>
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Re: What I'm missing in my Instaparse rules?
Thanks for your help.
I tried this new grammar to match characters only:
"
TEST = OBJECT
= <#'\\s+'>
OBJECT = CURLY_OPEN WHITESPACE* STRING WHITESPACE* (WHITESPACE* OBJECT
WHITESPACE*)* CURLY_CLOSE
= <'{'>
= <'}'>
STRING = #'[a-zA-Z]'
"
(parse "{harden {James}}")
Parse error at line 1, column 3:
{harden {James}}
^
Expected one of:
"}" (followed by end-of-string)
"{"
#"\s+"
On Sunday, June 12, 2016 at 10:07:01 PM UTC+2, puzzler wrote:
>
> Regular expressions are treated with their ordinary Java/Clojure, greedy
> semantics.
>
> Your regular expression for ITEM doesn't exclude whitespace or }
> characters, so ITEM is matching "Harden }" which leaves no characters left
> to match your grammar's right curly brace requirement.
>
> => (re-seq #"[^\"]+" "Harden }")
> ("Harden }")
>
> A solution would be to make the regex for ITEM more restrictive.
>
> On Sun, Jun 12, 2016 at 12:52 PM, Hussein B. <hubag...@gmail.com
> > wrote:
>
>> Hello,
>>
>> I'm playing around Instaparse library, starting very simple.
>>
>> For input like :
>>
>> { player }
>>
>> I created the following parser:
>>
>> (def ast
>> (ist/parser
>> "TEST = OBJECT
>> = <#'\\s+'>
>> = <'{'>
>> = <'}'>
>> ITEM = #'[^\"]+'
>> OBJECT = CURLY_OPEN WHITESPACE* ITEM WHITESPACE* CURLY_CLOSE"))
>>
>>
>> In the REPL:
>>
>> user=> (ast "{ Harden } ")
>>
>> Parse error at line 1, column 12:
>>
>> { Harden }
>>
>>^
>>
>> Expected one of:
>>
>> "}" (followed by end-of-string)
>>
>> #"\s+"
>>
>>
>> Any ideas what I'm doing wrong?
>>
>> Thanks for help.
>>
>> --
>> You received this message because you are subscribed to the Google
>> Groups "Clojure" group.
>> To post to this group, send email to clo...@googlegroups.com
>>
>> Note that posts from new members are moderated - please be patient with
>> your first post.
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>>
>
>
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What I'm missing in my Instaparse rules?
Hello,
I'm playing around Instaparse library, starting very simple.
For input like :
{ player }
I created the following parser:
(def ast
(ist/parser
"TEST = OBJECT
= <#'\\s+'>
= <'{'>
= <'}'>
ITEM = #'[^\"]+'
OBJECT = CURLY_OPEN WHITESPACE* ITEM WHITESPACE* CURLY_CLOSE"))
In the REPL:
user=> (ast "{ Harden } ")
Parse error at line 1, column 12:
{ Harden }
^
Expected one of:
"}" (followed by end-of-string)
#"\s+"
Any ideas what I'm doing wrong?
Thanks for help.
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Re: My Zipper isn't deleting what I thought is going to delete
Thanks a lot Moe for your help. I always appreciate your patience and
skills.
Would you explain why your zipper works in this case?
Thanks again.
On Thursday, August 27, 2015 at 12:11:14 PM UTC+2, Moe Aboulkheir wrote:
Hussein,
Making this change to the zipper definition:
(z/zipper #(get % children) #(get % children) (fn [p c] (assoc p
children c)) {children z})
looks like it'll do the right thing here.
Take care,
Moe
On Thu, Aug 27, 2015 at 11:03 AM, Hussein B. hubag...@gmail.com
javascript: wrote:
The modify function
(defn modify [loc]
(- loc z/remove))
On Thursday, August 27, 2015 at 11:58:31 AM UTC+2, Hussein B. wrote:
Hi,
I'm trying to remove an element from nested data structure (nesting in
unknown, so I'm trying to come up with a generic solution:
(def z [
{a {b 1 c 2}
children [{a {b 3 c 4}
children []}]}
{a {b 5 c 6}
children []}
{a {b 7 c 8}
children [{a {b 9 c 10}
children []}
{a {b 11 c 12}
children [{a {b 13 c 14} children []}
{a {b 15 c 16} children []}]}]}])
(def loz (z/zipper #(get % children) #(get % children) (fn [_ x ]
x)
{children z}))
(defn to-change? [loc]
(if (= 11 (get-in (z/node loc) [a b]))
true
false))
(loop [loc loz]
(if (z/end? loc)
(z/root loc)
(recur (z/next
(cond (to-change? loc)
(modify loc)
:else loc)
That gives a very wrong output:
({a {b 1, c 2}, children [{a {b 3, c 4}, children []}]}
{a {b 5, c 6}, children []} ({a {b 9, c 10}, children
[]}))
Parent {a {b 7 c 8} is getting deleted which is wrong.
What I'm doing wrong?
Thanks for help and time.
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javascript:
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My Zipper isn't deleting what I thought is going to delete
Hi,
I'm trying to remove an element from nested data structure (nesting in
unknown, so I'm trying to come up with a generic solution:
(def z [
{a {b 1 c 2}
children [{a {b 3 c 4}
children []}]}
{a {b 5 c 6}
children []}
{a {b 7 c 8}
children [{a {b 9 c 10}
children []}
{a {b 11 c 12}
children [{a {b 13 c 14} children []} {a
{b 15 c 16} children []}]}]}])
(def loz (z/zipper #(get % children) #(get % children) (fn [_ x ] x)
{children z}))
(defn to-change? [loc]
(if (= 11 (get-in (z/node loc) [a b]))
true
false))
(loop [loc loz]
(if (z/end? loc)
(z/root loc)
(recur (z/next
(cond (to-change? loc)
(modify loc)
:else loc)
That gives a very wrong output:
({a {b 1, c 2}, children [{a {b 3, c 4}, children []}]} {a
{b 5, c 6}, children []} ({a {b 9, c 10}, children []}))
Parent {a {b 7 c 8} is getting deleted which is wrong.
What I'm doing wrong?
Thanks for help and time.
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Re: My Zipper isn't deleting what I thought is going to delete
The modify function
(defn modify [loc]
(- loc z/remove))
On Thursday, August 27, 2015 at 11:58:31 AM UTC+2, Hussein B. wrote:
Hi,
I'm trying to remove an element from nested data structure (nesting in
unknown, so I'm trying to come up with a generic solution:
(def z [
{a {b 1 c 2}
children [{a {b 3 c 4}
children []}]}
{a {b 5 c 6}
children []}
{a {b 7 c 8}
children [{a {b 9 c 10}
children []}
{a {b 11 c 12}
children [{a {b 13 c 14} children []} {
a {b 15 c 16} children []}]}]}])
(def loz (z/zipper #(get % children) #(get % children) (fn [_ x ] x)
{children z}))
(defn to-change? [loc]
(if (= 11 (get-in (z/node loc) [a b]))
true
false))
(loop [loc loz]
(if (z/end? loc)
(z/root loc)
(recur (z/next
(cond (to-change? loc)
(modify loc)
:else loc)
That gives a very wrong output:
({a {b 1, c 2}, children [{a {b 3, c 4}, children []}]} {
a {b 5, c 6}, children []} ({a {b 9, c 10}, children []}))
Parent {a {b 7 c 8} is getting deleted which is wrong.
What I'm doing wrong?
Thanks for help and time.
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How to move an element within a vector?
Hi, For a vector like [A B C D E], how to remove an element to a specific location? For example [A D B C E] ? I thought about converting the vector into array but I would feel bad if I did that. What would be the idiomatic way to do that in Clojure? Thanks for help and time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Why I'm getting NPE with zipper/next?
Oh,
I defined my zipper as:
(def loz (z/zipper #(contains? % children) #(get % children) (fn [_ x
] x) {children z}))
But is throwing an exception.
This one works:
(def loz (z/zipper #(get % children) #(get % children) (fn [_ x ] x)
{children z}))
On Monday, August 24, 2015 at 4:08:17 PM UTC+2, Moe Aboulkheir wrote:
Went off half-cocked there. The remainder:
(edit-parents
#(= 10 (get-in % [a b]))
#(update % children reverse),
data-zipper)
Would have the effect of reversing the order of the children in each node
which possesses a child having a b attribute set to 10. You could
probably express this much better with a library which allows locations in
data structures to be described in an XPath-like way (and your data
actually looks a lot like it is the result of parsing markup - see
clojure.data.xml and xml-zip if so) -- or there's probably some better
zipper approach that somebody who's really into zippers could come up with.
If you don't want to depend on an external library, and you lose your
enthusiasm for zippers, you could write a function which goes over the
structure and returns pairs of [[path] attributes], where path is a
sequence of keys/indices suitable for passing to update-in/assoc-in etc.,
and attributes is the value of the a key at each level.
In general, if there aren't multiple keys similar to a in each map (i.e.
it's always some value pointing to some map, and the value is not always
a), this kind of layout may be easier (e.g. to destructure)
{:tag a :attrs {:b 10} :children [...]}}
Take care,
Moe
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Re: Why I'm getting NPE with zipper/next?
Hi Moi,
Thanks a lot for your patience and help.
I tried this so far:
(defn edit-parents [editable? edit loc]
(loop [loc loc]
(if (z/end? loc)
(z/root loc)
(if (editable? (z/node loc))
(recur (- loc z/up (z/edit edit) z/up z/next))
(recur (z/next loc))
(defn predicate [x]
(and
(vector? x)
(some #(= 10 (get-in % [a b])) x)))
(defn operation [x] (update x children reverse))
(edit-parents predicate operation (z/seq-zip {children z}))
But I'm still getting the same data. What I'm doing wrong?
Thanks a lot.
On Monday, August 24, 2015 at 4:08:17 PM UTC+2, Moe Aboulkheir wrote:
Went off half-cocked there. The remainder:
(edit-parents
#(= 10 (get-in % [a b]))
#(update % children reverse),
data-zipper)
Would have the effect of reversing the order of the children in each node
which possesses a child having a b attribute set to 10. You could
probably express this much better with a library which allows locations in
data structures to be described in an XPath-like way (and your data
actually looks a lot like it is the result of parsing markup - see
clojure.data.xml and xml-zip if so) -- or there's probably some better
zipper approach that somebody who's really into zippers could come up with.
If you don't want to depend on an external library, and you lose your
enthusiasm for zippers, you could write a function which goes over the
structure and returns pairs of [[path] attributes], where path is a
sequence of keys/indices suitable for passing to update-in/assoc-in etc.,
and attributes is the value of the a key at each level.
In general, if there aren't multiple keys similar to a in each map (i.e.
it's always some value pointing to some map, and the value is not always
a), this kind of layout may be easier (e.g. to destructure)
{:tag a :attrs {:b 10} :children [...]}}
Take care,
Moe
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Re: Why I'm getting NPE with zipper/next?
The result now is as desired:
({a {b 1, c 2}, children [{a {b 3, c 4}, children []}]}
{a {b 5, c 6}, children []} {a {b 7, c 8}, children ({a
{b 10, c 10}, children []} {a {b 9, c 10}, children []})})
But now the updated children is using list notation, not vector. Is it ok
or it is for displaying purposes?
Thanks a lot for your help. I was burning to know how to do that with
Zippers. I want to understand zippers.
On Monday, August 24, 2015 at 4:08:17 PM UTC+2, Moe Aboulkheir wrote:
Went off half-cocked there. The remainder:
(edit-parents
#(= 10 (get-in % [a b]))
#(update % children reverse),
data-zipper)
Would have the effect of reversing the order of the children in each node
which possesses a child having a b attribute set to 10. You could
probably express this much better with a library which allows locations in
data structures to be described in an XPath-like way (and your data
actually looks a lot like it is the result of parsing markup - see
clojure.data.xml and xml-zip if so) -- or there's probably some better
zipper approach that somebody who's really into zippers could come up with.
If you don't want to depend on an external library, and you lose your
enthusiasm for zippers, you could write a function which goes over the
structure and returns pairs of [[path] attributes], where path is a
sequence of keys/indices suitable for passing to update-in/assoc-in etc.,
and attributes is the value of the a key at each level.
In general, if there aren't multiple keys similar to a in each map (i.e.
it's always some value pointing to some map, and the value is not always
a), this kind of layout may be easier (e.g. to destructure)
{:tag a :attrs {:b 10} :children [...]}}
Take care,
Moe
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Re: Why I'm getting NPE with zipper/next?
I see. I tried to add more nested elements into my original structure but now the output isn't correct. My question is: Is it possible to implement a generic algorithm with Zippers that could traverse as long as needed and update an item? Maybe I'm doing zippers wrong in this case. Thanks a lot for your time and your helpful answers. Now I started to understand zippers, thanks to you. On Monday, August 24, 2015 at 7:36:17 PM UTC+2, Moe Aboulkheir wrote: Hussein, On Mon, Aug 24, 2015 at 5:40 PM, Hussein B. hubag...@gmail.com javascript: wrote: But now the updated children is using list notation, not vector. Is it ok or it is for displaying purposes? The collection type is now different, as the example I gave uses reverse as the transform, which is a generic sequence function - it doesn't care that it was passed a vector. It may not matter - it depends on how you're using the sequences. In this specific case, modifying the transform in the example to #(update % children (comp vec reverse)) will result in a vector, though there are more general ways of doing this without baking the collection type in everywhere (into (empty x) (reverse x)). Take care, Moe -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Why I'm getting NPE with zipper/next?
Hi Moe,
I have this structure:
[{a {b 1 c 2}
children [{a {b 3 c 4} children []}]}
{a {b 5 c 6} children []}
{a {b 7 c 8}
children [{a {b 9 c 10} children []} {a {b 10 c 10}
children []}]}]
That is only a sample, the actual data is bigger is properly more one or
two nesting in the children attribute.
I need to find a map by a criteria, say where b = 10 ({a {b 10 c 10}
children []})
Once it is found, I need to change its position within its parent. The
parent is {a {b 7 c 8}
I know that zippers are for editing data structures but I'm not sure how to
do it.
Thanks for help and time.
On Friday, August 21, 2015 at 7:14:13 PM UTC+2, Moe Aboulkheir wrote:
Hussein,
I don't get an NPE passing that to traverse, but nothing much
interesting happens either. The top-level data structure (and the
vectors within children) aren't associative, and so don't pass the
branch? test (contains? % children).
You could certainly extend the zipper to cover both cases, but there
may well be a more compact way to accomplish your goal. What do you
want to do with the piece of data?
Take care,
Moe
On Fri, Aug 21, 2015 at 5:57 PM, Hussein B. hubag...@gmail.com
javascript: wrote:
Here is my zipper:
(z/zipper #(contains? % children) #(get % children) (fn [_ c] c)
s)
On Friday, August 21, 2015 at 6:49:25 PM UTC+2, Moe Aboulkheir wrote:
Hussein,
How are you constructing your zipper, before passing it to traverse?
Note that clojure.zip doesn't work on arbitrary data structures
without being given some information about how to descend
into/construct nodes, etc. - i.e. z/next expects a zipper, and your
data structure isn't a zipper, but an input to a zipper. Unless
you've written a zipper you omitted from your post, zipping over maps,
in particular, may not be as convenient as you're imagining.
https://clojuredocs.org/clojure.zip/zipper has helpful examples in it.
Take care,
Moe
On Fri, Aug 21, 2015 at 5:06 PM, Hussein B. hubag...@gmail.com
wrote:
Hi,
I changed println to z/node , this time I'm getting:
NullPointerException clojure.zip/branch? (zip.clj:73)
On Friday, August 21, 2015 at 5:56:10 PM UTC+2, Moe Aboulkheir wrote:
Hussein,
The println inside (recur) will return nil.
Take care,
Moe
On Fri, Aug 21, 2015 at 4:35 PM, Hussein B. hubag...@gmail.com
wrote:
Hi,
I have this structure:
(def s [{n {id a} d 2 children [{n {id c} d 4
children
[]}]} {n {id b} d 3 children []}])
And I wrote a function with zippers to traverse it:
(defn traverse [col]
(loop [z col]
(if (= (z/next z) z)
z
(if (z/branch? z)
(recur (z/next z))
(recur (- z println z/next))
But I'm getting: NullPointerException clojure.zip/next
(zip.clj:236)
Any ideas?
Thanks for help.
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Why I'm getting NPE with zipper/next?
Hi,
I have this structure:
(def s [{n {id a} d 2 children [{n {id c} d 4 children
[]}]} {n {id b} d 3 children []}])
And I wrote a function with zippers to traverse it:
(defn traverse [col]
(loop [z col]
(if (= (z/next z) z)
z
(if (z/branch? z)
(recur (z/next z))
(recur (- z println z/next))
But I'm getting: NullPointerException clojure.zip/next (zip.clj:236)
Any ideas?
Thanks for help.
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Re: Why I'm getting NPE with zipper/next?
Hi,
I changed println to z/node , this time I'm getting:
NullPointerException clojure.zip/branch? (zip.clj:73)
On Friday, August 21, 2015 at 5:56:10 PM UTC+2, Moe Aboulkheir wrote:
Hussein,
The println inside (recur) will return nil.
Take care,
Moe
On Fri, Aug 21, 2015 at 4:35 PM, Hussein B. hubag...@gmail.com
javascript: wrote:
Hi,
I have this structure:
(def s [{n {id a} d 2 children [{n {id c} d 4
children
[]}]} {n {id b} d 3 children []}])
And I wrote a function with zippers to traverse it:
(defn traverse [col]
(loop [z col]
(if (= (z/next z) z)
z
(if (z/branch? z)
(recur (z/next z))
(recur (- z println z/next))
But I'm getting: NullPointerException clojure.zip/next (zip.clj:236)
Any ideas?
Thanks for help.
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Re: How can find something inside heavily nested data structure ?
Yes, that does the job. Thanks for your help and time.
On Thursday, August 20, 2015 at 12:21:47 AM UTC+2, Alan Forrester wrote:
On 19 Aug 2015, at 18:08, Hussein B. hubag...@gmail.com javascript:
wrote:
Here is more concrete example
(def s [{n {id a} d 2 children [{n {id c} d 4
children nil}]} {n {id b} d 3 children nil}])
I want to find the map that has value c for id. If found, I need to
return the map {n {id c} d 4 children nil}
One way to do this follows. First get all of the sub-maps, which you can
do with the following two functions:
(defn get-lower [x] (tree-seq coll? identity x))
(defn get-maps-from-lower [x] (filter map? (get-lower x))).
The first function gets all of the lower level colls, the second picks the
maps out of those colls.
You then need a function that will rummage round in a coll x looking to
see if it has the relevant element r:
(defn rummager [x r] (some #(= r %) x))
You then use rummager to get maps with the appropriate val
(defn get-map-with-val [v x]
(first (filter #(rummager (vals %) v) (get-maps-from-lower x.
Trying this out in the repl I get
= (get-map-with-val {id c} s)
{d 4, n {id c}, children nil}
which I believe is the result you wanted.
Alan
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Re: Why I'm getting NPE with zipper/next?
Here is my zipper:
(z/zipper #(contains? % children) #(get % children) (fn [_ c] c) s)
On Friday, August 21, 2015 at 6:49:25 PM UTC+2, Moe Aboulkheir wrote:
Hussein,
How are you constructing your zipper, before passing it to traverse?
Note that clojure.zip doesn't work on arbitrary data structures
without being given some information about how to descend
into/construct nodes, etc. - i.e. z/next expects a zipper, and your
data structure isn't a zipper, but an input to a zipper. Unless
you've written a zipper you omitted from your post, zipping over maps,
in particular, may not be as convenient as you're imagining.
https://clojuredocs.org/clojure.zip/zipper has helpful examples in it.
Take care,
Moe
On Fri, Aug 21, 2015 at 5:06 PM, Hussein B. hubag...@gmail.com
javascript: wrote:
Hi,
I changed println to z/node , this time I'm getting:
NullPointerException clojure.zip/branch? (zip.clj:73)
On Friday, August 21, 2015 at 5:56:10 PM UTC+2, Moe Aboulkheir wrote:
Hussein,
The println inside (recur) will return nil.
Take care,
Moe
On Fri, Aug 21, 2015 at 4:35 PM, Hussein B. hubag...@gmail.com
wrote:
Hi,
I have this structure:
(def s [{n {id a} d 2 children [{n {id c} d 4
children
[]}]} {n {id b} d 3 children []}])
And I wrote a function with zippers to traverse it:
(defn traverse [col]
(loop [z col]
(if (= (z/next z) z)
z
(if (z/branch? z)
(recur (z/next z))
(recur (- z println z/next))
But I'm getting: NullPointerException clojure.zip/next
(zip.clj:236)
Any ideas?
Thanks for help.
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How can find something inside heavily nested data structure ?
Hi, I have transformed JSON response into the equivalent data structure using Cheshire library. The result is a huge nested data structure , mostly vectors and maps. It is actually a tree. How to find a property that is nested deep inside the tree ? For example I'm search for the node that has the value zyx for property uuid. What I'm supposed to use? Something like zipper or walk? or something simpler is available? Thanks for help. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: How can find something inside heavily nested data structure ?
Each node is represented as map:
{prop1 prop2 prop3 children}
children is a vector of nested nodes
[
prop1
prop2
children
[
{prop1 prop2 children []}
{prop1 prop2 children [{new-node} {new-node} ... {another-node}]
]
[
{prop1 prop2 children []}
{prop1 prop2 children [{new-node} {new-node}]
]
]
I need to traverse the structure to find the node (the map data structure)
that has a specific value, say for prop2.
I tried:
(defn is-it-node? [coll]
(not (nil? (get coll children
(filter #(= 12345 (get % prop2)) (tree-seq #(is-it-node? %) identity
navigation-tree))
But I'm getting nothing actually.
On Wednesday, August 19, 2015 at 5:36:42 PM UTC+2, Gary Verhaegen wrote:
If you want more specific answers, you'll need to describe the
structure of your tree. In particular, what is the relationship
between your conceptual nodes and your data structures (vectors and
maps)?
On 19 August 2015 at 17:26, Andy- andre...@gmail.com javascript:
wrote:
I have yet to evaluate it myself but this might do help you:
https://github.com/nathanmarz/specter
On Wednesday, August 19, 2015 at 10:18:06 AM UTC-4, Hussein B. wrote:
Hi,
I have transformed JSON response into the equivalent data structure
using
Cheshire library.
The result is a huge nested data structure , mostly vectors and maps.
It
is actually a tree.
How to find a property that is nested deep inside the tree ? For
example
I'm search for the node that has the value zyx for property uuid.
What I'm supposed to use? Something like zipper or walk? or something
simpler is available?
Thanks for help.
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Re: How can find something inside heavily nested data structure ?
Here is more concrete example
(def s [{n {id a} d 2 children [{n {id c} d 4 children
nil}]} {n {id b} d 3 children nil}])
I want to find the map that has value c for id. If found, I need to
return the map {n {id c} d 4 children nil}
On Wednesday, August 19, 2015 at 5:36:42 PM UTC+2, Gary Verhaegen wrote:
If you want more specific answers, you'll need to describe the
structure of your tree. In particular, what is the relationship
between your conceptual nodes and your data structures (vectors and
maps)?
On 19 August 2015 at 17:26, Andy- andre...@gmail.com javascript:
wrote:
I have yet to evaluate it myself but this might do help you:
https://github.com/nathanmarz/specter
On Wednesday, August 19, 2015 at 10:18:06 AM UTC-4, Hussein B. wrote:
Hi,
I have transformed JSON response into the equivalent data structure
using
Cheshire library.
The result is a huge nested data structure , mostly vectors and maps.
It
is actually a tree.
How to find a property that is nested deep inside the tree ? For
example
I'm search for the node that has the value zyx for property uuid.
What I'm supposed to use? Something like zipper or walk? or something
simpler is available?
Thanks for help.
--
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How to transform this structure idiomaticlly in Clojure?
Hi, I have the following structure. Node has a string properly and a vector nodes and of course, each node has a string a property and a vector of nodes. So I created the following record: (defrecord Node [title childs]) And I have the following JSON response: node string [ node1 [ nn1 nn2 .. nnn] node2 [ nn1 nn2 .. nnn] ] What I want to achieve is to transform that JSON response into the equivalent structure with Node recored type. Thanks for help and time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
As framework creator, how would you get user defined specific functions/macros?
Hi, Lets say that you are framework creator and to use your framework, you defined a macro called defcontroller where the users of your framework add their logic. You -as framework creator- how would you load user defined source code files and collect their defcontroller definitions? Thanks for help. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Understanding how a collection reduce itself
Thank you all and especially @James. That is exactly what I'm missing. Thanks again for help. On Wednesday, September 24, 2014 5:51:09 PM UTC+2, James Reeves wrote: Reducers primarily have two benefits: 1. You don't need to create intermediate seqs 2. You can use them to perform a parallel fold When you use clojure.core/map, it creates a lazy seq. When you use clojure.core.reducers/map, it returns a small reified object that implements CollReduce. Perhaps the best way to understand what's going on is to start with the normal seq functions. For instance, consider this code: (let [ys (map inc xs)] (filter even? ys)) In this example, an intermediate seq, ys, needs to be constructed. We can avoid this intermediate seq by using a reduce that combines both steps: (reduce (fn [r x] (if (even? x) (conj r (inc x)) r) [] xs) The problem with this approach is that it's rather complected. What we need is something that resolves to a reduce, but can be combined like map and filter. This is where reducers come in. The main idea is to factor out that pesky conj, so we can separating the reduction from the implementation details of the collection. So we can take the inner reducing function: (fn [r x] (if (even? x) (conj r (inc x)) r) And then factor out conj: (fn [f] (fn [r x] (if (even? x) (f r (inc x)) r)) We can then split out the filter and map to get two functions (fn [f] (fn [r x] (if (even? x) (f r x) r)) (fn [f] (fn [r x] (f r (inc x))) And then take out even? and inc to get generic filter and map functions: (defn filterer [xf] (fn [f] (fn [r x] (if (xf x) (f r x) r)) (defn mapper [xf] (fn [f] (fn [r x] (f r (xf x))) So now we have the essence of map and filter, but we've removed the implementation details of the collection. Next we just need to figure out how to use these highly abstracted functions. If we just want to use one of the functions, we can do so like this: ((mapper inc) conj) This returns a function: (fn [r x] (conj r (inc x))) If we want to combine map and filter, we need an expression like: (fn [r x] (if (even? x) (conj r (inc x)) r)) We can do this by passing the result of the mapping function into filterer as f: ((filterer even?) ((mapper inc) conj)) Or, we could use comp to compose the two functions, then apply conj, since (f (g x)) is the same as ((comp f g) x): ((comp (filterer even?) (mapper inc)) conj)) Now we can can finally create our efficient map/filter in a clean way: (let [f (comp (filterer even?) (mapper inc))] (reduce (f conj) [] xs)) The reducer library goes one step further, and uses protocols to make it a little nicer to use, but the mechanics are more or less the same. - James On 24 September 2014 15:30, Hussein B. hubag...@gmail.com javascript: wrote: To elaborate more, I know that with reducers, map for example isn't going to create the resulting sequence by using cons. That is clear to me. But, if the collections is going to call cons while reducing itself, then I'm not sure what is the benefit of reducers (besides it makes sense and makes a nice abstraction). Thanks. On Wednesday, September 24, 2014 2:58:18 PM UTC+2, Aleš Roubíček wrote: Resulting function is passed to reduction function as an recipe, how to process the data. Collections implements CollReduce protocol. When you call reduce function it will delegate the work to concrete implementation of the protocol. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com javascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Understanding how a collection reduce itself
When the collection is reducing itself, it is going to create a sequence and call cons, conj or something like. If this is true, then I'm not sure what reducers is bringing to the table. Because according to what I read, by using reducers, map/filter functions aren't going to create and allocate cons. On Wednesday, September 24, 2014 2:58:18 PM UTC+2, Aleš Roubíček wrote: Resulting function is passed to reduction function as an recipe, how to process the data. Collections implements CollReduce protocol. When you call reduce function it will delegate the work to concrete implementation of the protocol. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Understanding how a collection reduce itself
To elaborate more, I know that with reducers, map for example isn't going to create the resulting sequence by using cons. That is clear to me. But, if the collections is going to call cons while reducing itself, then I'm not sure what is the benefit of reducers (besides it makes sense and makes a nice abstraction). Thanks. On Wednesday, September 24, 2014 2:58:18 PM UTC+2, Aleš Roubíček wrote: Resulting function is passed to reduction function as an recipe, how to process the data. Collections implements CollReduce protocol. When you call reduce function it will delegate the work to concrete implementation of the protocol. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Understanding how a collection reduce itself
Hi, I spent a considerable time trying to understand reducers. I got the concept of how the map/filter function will return a function and it is not going to iterate over a sequence and it is not going to create a new sequence. The missing part though, who is creating the sequence? They say a collection now knows how to reduce it self but I'm not getting that. I tried and I failed. Would you please help with that? Thanks for help and time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
How to know if an agent throw an exception?
Hi, When using send-off of an Agent, how to know if any exception is happened? Since AFAIK, agents are executed in different thread. Currently, I'm calling (agent-error) but nothing is logged. Maybe nothing went wrong but some how I'm sure something went wrong. Thank you. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
How to tackle this concurrency problem?
Hi, I have a ref that saves the ID of last processed event. Of course, I'm using Clojure STM facility. The problem now is I can't control the value of the ref. Due massive concurrency, it is updated and my logic is broken. How to guard, and really guard the update of that ref? Should I do (locking) ? Thanks for help and time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
When to use (ensue) ?
Hi, When dealing with Clojure ref types, when to use (ensure) ? Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
How to add elements to a vector that is the value of a map key?
Hi,
This is a very basic question, so be patient please! :)
I have an empty map where key is an integer and the value is a vector.
How I can add an element to the vector of a specific key?
For example:
{1 [11]}
Then
{1 [ 11 22]}
Thanks for help and time.
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Re: How to add elements to a vector that is the value of a map key?
Please keep in mind that I'm starting from an empty map. So, I'm looking
for an idiomatic Clojure code to achieve my purpose where if the map
doesn't has that specific key, it will create an entry of that key and add
the value to the newly created vector. And if the key exists, then add the
value to the existing vector.
On Tuesday, June 17, 2014 7:21:43 PM UTC+2, Hussein B. wrote:
Hi,
This is a very basic question, so be patient please! :)
I have an empty map where key is an integer and the value is a vector.
How I can add an element to the vector of a specific key?
For example:
{1 [11]}
Then
{1 [ 11 22]}
Thanks for help and time.
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Re: How to add elements to a vector that is the value of a map key?
Thanks, it works.
In case, my initial map is a ref type
(def m (ref { } ))
Why this isn't working?
(dosync
(alter m #(update-in @v [1] (fnil conj [ ])) 11))
On Tuesday, June 17, 2014 7:55:14 PM UTC+2, Mauricio Aldazosa wrote:
For updating the value of a map given a key you can use update-in:
user (update-in {1 [11]} [1] conj 22)
{1 [11 22]}
Now, to handle the case when the key is not present, you can use fnil:
user (update-in {} [1] (fnil conj []) 22)
{1 [22]}
Cheers,
Mauricio
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Re: How to add elements to a vector that is the value of a map key?
Oh, this works
(dosync (alter v #(update-in %1 [1] (fnil conj [ ]) %2) 33))
On Tuesday, June 17, 2014 8:05:10 PM UTC+2, Hussein B. wrote:
Thanks, it works.
In case, my initial map is a ref type
(def m (ref { } ))
Why this isn't working?
(dosync
(alter m #(update-in @v [1] (fnil conj [ ])) 11))
On Tuesday, June 17, 2014 7:55:14 PM UTC+2, Mauricio Aldazosa wrote:
For updating the value of a map given a key you can use update-in:
user (update-in {1 [11]} [1] conj 22)
{1 [11 22]}
Now, to handle the case when the key is not present, you can use fnil:
user (update-in {} [1] (fnil conj []) 22)
{1 [22]}
Cheers,
Mauricio
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Re: How to add elements to a vector that is the value of a map key?
Nice! :)
Thanks all for help.
On Tuesday, June 17, 2014 9:00:06 PM UTC+2, Thomas Heller wrote:
On Tuesday, June 17, 2014 8:16:36 PM UTC+2, Hussein B. wrote:
Oh, this works
(dosync (alter v #(update-in %1 [1] (fnil conj [ ]) %2) 33))
Not sure what %2 or 33 are doing there but you can skip the #() function,
alter (just like update-in) uses apply internally so you can just use:
(def v (ref {}))
(dosync (alter v update-in [1] (fnil conj []) 22))
= {1 [22]}
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Doing Socket IO inside STM transaction
Hi, I have a ServerSocket that stores the client ID and the client socket object into a ref type. And I also have a thread that is running in the background that checks if a specific condition is met, then it will start send notifications to the clients (it will use the client-id-ref and messages-ref). Of course, since both are refs; any operation needs to be run under a STM transaction. My question is, is it ok to do IO Socket operation inside a STM transaction? STM transaction might retry, this means that there are great chances that the clients will receive the notifications more than once. For Socket IO operations inside STM transaction, is better/recommended to do it using Agents? Since, AFAIK, agents inside a transaction will be executed only if the transaction is successful. Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Doing Socket IO inside STM transaction
I think send-off is used for IO operations, or? If an agent is started with messages [1 2 3] and then another agent started with messages [4 5] , is it guaranteed that messages [1 2 3] will be delivered before [4 5]? I'm talking about production and really concurrent system. On Tuesday, June 17, 2014 11:45:52 PM UTC+2, Gary Trakhman wrote: Agent send operations inside a transaction get queued up and don't actually get sent until the transaction commits, that's probably what you want, it's meant for side-effects. On Tue, Jun 17, 2014 at 5:43 PM, Hussein B. hubag...@gmail.com javascript: wrote: Hi, I have a ServerSocket that stores the client ID and the client socket object into a ref type. And I also have a thread that is running in the background that checks if a specific condition is met, then it will start send notifications to the clients (it will use the client-id-ref and messages-ref). Of course, since both are refs; any operation needs to be run under a STM transaction. My question is, is it ok to do IO Socket operation inside a STM transaction? STM transaction might retry, this means that there are great chances that the clients will receive the notifications more than once. For Socket IO operations inside STM transaction, is better/recommended to do it using Agents? Since, AFAIK, agents inside a transaction will be executed only if the transaction is successful. Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com javascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Doing Socket IO inside STM transaction
you mean one agent to deliver the notifications. true? On Wednesday, June 18, 2014 12:01:42 AM UTC+2, Gary Trakhman wrote: Yea, send uses a fixed threadpool, and send-off uses a growing one, so it's more suitable for IO-bound tasks. I don't think there's any difference in terms of how it looks from STM. 2 agents will have 2 independent queues, even though they might share threadpools, if you want to guarantee order, you need one queue. On Tue, Jun 17, 2014 at 5:54 PM, Hussein B. hubag...@gmail.com javascript: wrote: I think send-off is used for IO operations, or? If an agent is started with messages [1 2 3] and then another agent started with messages [4 5] , is it guaranteed that messages [1 2 3] will be delivered before [4 5]? I'm talking about production and really concurrent system. On Tuesday, June 17, 2014 11:45:52 PM UTC+2, Gary Trakhman wrote: Agent send operations inside a transaction get queued up and don't actually get sent until the transaction commits, that's probably what you want, it's meant for side-effects. On Tue, Jun 17, 2014 at 5:43 PM, Hussein B. hubag...@gmail.com wrote: Hi, I have a ServerSocket that stores the client ID and the client socket object into a ref type. And I also have a thread that is running in the background that checks if a specific condition is met, then it will start send notifications to the clients (it will use the client-id-ref and messages-ref). Of course, since both are refs; any operation needs to be run under a STM transaction. My question is, is it ok to do IO Socket operation inside a STM transaction? STM transaction might retry, this means that there are great chances that the clients will receive the notifications more than once. For Socket IO operations inside STM transaction, is better/recommended to do it using Agents? Since, AFAIK, agents inside a transaction will be executed only if the transaction is successful. Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com javascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
How to unit test (defn-) functions?
Hi, I like to use (defn-) when it comes to internal implementation functions. But since they aren't exposed, how to unit test them? Of course, I'm using Lein and clojure.test Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Clojure:Lisp :: LSD:Meditation
Thanks. Now, I have a clue how to skip some posts here. On Thursday, June 12, 2014 3:41:13 PM UTC+2, Divyansh Prakash wrote: I compare Clojure to acid in this http://pizzaforthought.blogspot.in/2014/06/clojurelisp-lsdmeditation.html rant. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
How to iterate over maps and drop one specific element each time?
Hi,
I have a seq of maps:
[ {:op :e :v 1} {:op :n :b 2} {:op :m :z 2.3} ]
How to iterate over the sequence and extracting only the non-op entries?
Desired result is:
[ {:v 1} {:b 2} {:z 2.3} ]
Thanks for help and time.
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What is going wrong in my code?
Hi,
I'm trying to learn how to make DSL in Clojure and Korma project is a
really good place to learn from. I'm trying this very simple stuff
(inspired by Korma, not Korma code):
(def predicates {'and :and
'or :or
'not :not
' :gt
' :lt
'= :eq})
(defn parse-where
[form]
(walk/postwalk-replace predicates form))
(defn condition-map [clause]
(apply hash-map (conj clause :op)))
(defn clauses-vec [clauses]
(reduce #(conj %1 (condition-map %2)) [ ] (rest clauses)))
(defn select* [ ]
{:type :select})
(defmacro select
[ body]
(make-query-then-execute #'select* body))
(defn- make-query-then-execute [fn-var body]
`(let [query-map# (- (~fn-var) ~@body)]
query-map#))
(defn where-form [where-form* query form]
`(let [q# ~query]
(~where-form* q# (clauses-vec ~(parse-where `~form)
(defmacro where [query form]
(where-form #'where* query form))
(defn where* [query clause]
(update-in query [:where] conj clause))
But when I'm trying in the REPL:
(select
(where
(and (= :version 1.6) (= :name Clojure))
I'm getting:
ClassCastException java.lang.Character cannot be cast to
clojure.lang.IPersistentCollection clojure.core/conj (core.clj:83)
It is really hard to me to know what is going wrong. What is confusing me,
if I'm trying the where macro alone, it is working as excepted but when
integrating it with select macro, I got the exception.
I know it is not your problem but your help is greatly appreciated.
Thanks for help and time.
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How to convert this list into map?
Hi,
I have this list:
(:= :language Clojure)
And I want to convert it to the following map data structure:
{:op := , :language Clojure}
I can't really think of a clear way how to do it.
Would you please help?
Thanks for help and time.
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Re: How to convert this list into map?
That is beautiful! Thanks a lot!
On Sunday, May 11, 2014 12:33:51 AM UTC+2, Mike Fikes wrote:
Here is how you can derive that expression:
{:op :=, :language Clojure}
is the same as
(hash-map :op := :language Clojure)
which is the same as
(apply hash-map '(:op := :language Clojure))
So, all you need is
'(:op := :language Clojure)
which can be produced by prepending :op to your original list
(conj '(:= :language Clojure) :op)
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In Lein, is it possible to run a specific test suite?
Hi, I'm using clojure.test and Lein. Is it possible to run a specific test suit ? I don't want to run the whole test each time. Thanks for help and time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Why this Clojure part is working in Korma and no exception is thrown?
Hi,
I'm trying to study the source code of Korma project.
(insert users
(values {:first john :last doe}))
This will resolve to (defmacro insert)
https://github.com/korma/Korma/blob/master/src/korma/core.clj#L143
Will call (defn- make-query-then-execute)
https://github.com/korma/Korma/blob/master/src/korma/core.clj#L109
What I don't get is the following:
`(let [query# (- (~query-fn-var ~@args)
~@body)]
(~query-fn-var ~@args) will generate a map that will be feed to (defn values)
which accepts two arguments.
https://github.com/korma/Korma/blob/master/src/korma/core.clj#L280
I expected that part to throw:
CompilerException clojure.lang.ArityException: Wrong number of args (1) passed
to: core/values
But it is not.
Any ideas why it is working?
Thanks for help and time.
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Idiomatic Clojure for iterating all items of a map
Hi,
For a data structure such as:
(def langs {:langs [ {:lang Clojure :version 1.6}
{:lang Erlang :version 17} ] } )
How to iterate all the items of the maps?
I tried this but it is too imperative to me:
(doseq [lang (:langs langs)
(doseq [k (keys lang)]
(str k(k lang
Thanks for help and time.
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Dealing with edn for the first time
Hi, I want to save the configuration of my application in edn file. Lein is used (of course). I want to pub my config.edn under /resources directory. But honestly, I don't know the format of edn. I tried to google it, but I didn't get anything helpful. The format is in its early stages. So, my questions: 1) What is the equivalent of the following in edn: database.url=localhost username=foo password=bar 2) Since my edn file is under /resources . I need a way to read from the classpath. How to do this? Thanks for help and time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Why (eval (list (quote (println Clojure)))) is throwing a Null Pointer Exception?
Hi, Why the following snippet: (eval (list (quote (println Clojure is throwing a null pointer exception? Thanks for help and time. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Entwined STM V1.0
Great ! Congratulations! How it does compare with Clojure's builtin STM? Thanks. On Sunday, August 18, 2013 10:24:48 AM UTC+2, Ivan Koblik wrote: Hi All, Almost 4 years ago I developed STM with semantic concurrency control for my project at CERN. Main feature of this STM is the TransactionalMap that lets you merge concurrent changes. Library is heavily tested and is very stable. It has been used in production for the past 2 years. Recently I released it on GitHub: http://entwined.koblik.ch (will redirect to https://github.com/CERN-BE/Entwined-STM) Since Entwined STM was designed to be used from Java I wrote a simple facade for it in Clojure that you can load with (require '[cern.entwined.core :as stm]) Entwined STM operates on a memory with a fixed structure, meaning that you have to define what and how many collections you want to have in your STM and this can't be changed after construction. To construct memory with 1 transactional map and 1 transactional queue run this: (def memory (stm/create-memory :map (stm/create-map) :queue (stm/create-queue))) It's impossible to access transactional entities outside of a transaction, to run a transaction you can use intrans macro (stm/intrans memory data (- data :map (.put :key1 value1)) true) (stm/intrans memory data (- data :map (.get :key1))) ;- value1 First line puts [:key1 value1] pair into the map. True at the end of the body tells the memory to commit this transaction. intrans will initiate commit if body returns truthy value. Second line just shows that the change has been committed. A couple more words on the implementation: I used HashMap to implement the TransactionalMap, I copy the backing map for every transaction which may be expensive for some scenarios. Obvious solution would be to use Clojure's persistent map. Commits are eventually serialized and protected with a single lock. If you take a look at the Java source you'll see that Transaction interface has a second method committed that is called when commit is being done. I use this method to write to the hardware knowing that execution order of committed callbacks is the same as the commit order. I would greatly appreciate any feedback and suggestions. If you have any questions don't hesitate to ask here or email me directly. Documentation is still somewhat lacking and I'd be interested to know which parts of it should be improved first. Cheers, Ivan. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Help to morph this imperative snippet into a functional one
Hi!
Would you please help me transforming this imperative code into functional
one?
The code is a typical snippet in imperative style. A lot of mutations that
I don't even know how to start morphing it to Clojure.
class Container {
MapString, Container children;
String letter;
ListString value;
}
void insert(Container container, String letters, String value) {
for (int i = 0; i letters.length; i++) {
String letter = new String(letters.chatAt[i]);
if (container.children.get(letter) != null) {
container = container.children.get(letter);
} else {
MapContainer childContainer = new HashMap();
container.children.put(letter, childContainer);
container = container.children.get(letter);
}
if (i == letters.length() - 1) {
container.values.add(value);
break;
}
}
Thanks for help and time.
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Re: Help to morph this imperative snippet into a functional one
It might be Huffman coding but I don't know Hoffman coding in depth, so I
can't be precise. :)
But any way, it is a snippet written in an imperative style that I'm trying
to transfer into a functional one.
The amount of mutation and the if statements are blocking me from doing it
in Clojure.
On Sunday, August 18, 2013 4:27:43 PM UTC+2, Chris Ford wrote:
Can you explain what the code is supposed to do in English? Java is a
little hard to read. :-)
Are you doing Huffman coding or similar?
On 18 August 2013 16:51, Hussein B. hubag...@gmail.com javascript:wrote:
Hi!
Would you please help me transforming this imperative code into
functional one?
The code is a typical snippet in imperative style. A lot of mutations
that I don't even know how to start morphing it to Clojure.
class Container {
MapString, Container children;
String letter;
ListString value;
}
void insert(Container container, String letters, String value) {
for (int i = 0; i letters.length; i++) {
String letter = new String(letters.chatAt[i]);
if (container.children.get(letter) != null) {
container = container.children.get(letter);
} else {
MapContainer childContainer = new HashMap();
container.children.put(letter, childContainer);
container = container.children.get(letter);
}
if (i == letters.length() - 1) {
container.values.add(value);
break;
}
}
Thanks for help and time.
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Help to start creating this DSL in Clojure
Hi, I'm trying to create this Domain Specific Language: (query clojure (directory /usr/texts) (group-by :creation-date)) What it should do is to search for all files in a specific directory using a regexp and then group the result by some of files attributes. The idea is the (query) created a RegExp object. (directory) to specify which directory to scan. (group-by) is to group the files names by creation-date of the files. (query) will use Java RegExp library. (directory) will use java.io package. ** I know that I can use Clojure functions for RegExp and IO but I want to try to create it using Java libraries ** Any starting points are really appreciated. Thanks for help and time. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [ANN] Pedestal-app Tutorial has been released
O, Yeah! Thanks! On Tuesday, July 9, 2013 6:03:58 PM UTC+2, Ryan Neufeld wrote: Hey there, Clojurians/Pedestallions! I'm pleased to announce the release of a comprehensive tutorial for pedestal-app: http://bit.ly/pedestal-app-tutorial. In this tutorial we finally *dive deep* into the guts of pedestal-app and build a distributed multiplayer game using pedestal-app. Major kudos to @brentonashworth for all his hard work on the pedestal-app tutorial. Enjoy! -- Ryan Neufeld -- Ryan Neufeld -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
How core.async compares to agents, future and promise?
Hi, How core.async compares to agents, future and promise? When to use core.async and when to use agents, future and promise? Thanks for help and time. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
How to implement a distributed and concurrent system in Clojure?
Hi, I read recently on the internet that Clojure concurrency tools make it easy to implement a highly concurrent system but on a single machine. But how to implement a highly concurrent system that runs on a multiple machines? Erlang, Elixir and Scala have the Actors model. Please correct me if I'm wrong. Thanks for help and time. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Is it possible to parameterize proxy macro with defmacro?
Hi,
After I got your help last week to get my Macro working :) I tried to
expand it more:
I'm trying to parameterizing my object creation (I'm using
clojure.core.match). Source class offers multiple constructors:
(defmacro source [source-name constructor-args meths]
(match [constructor-args]
[{}]
`(def ~source-name (proxy [Source]
[]
~@(for [meth meths]
(let [[method-name args body] meth
camel-case-method-name (hyphenated-camel-case method-name)]
`(~camel-case-method-name ~args ~@body)
[{:method _ :resource _}]
(let [^Method meth (:method constructor-args)
^Reference reference (:resource constructor-args)]
`(def ~source-name (proxy [Source]
[^Method meth ^Reference reference]
~@(for [meth meths]
(let [[method-name args body] meth
camel-case-method-name (hyphenated-camel-case
method-name)]
`(~camel-case-method-name ~args ~@body
But when macroexpand, I notice the called proxy is the one with the empty
constructor, not the one that takes two parameters.
Am I missing something?
Thanks for help and time.
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Re: Clojure in production
I mentioned that! :D On Wednesday, June 19, 2013 9:40:57 AM UTC+2, Florian Over wrote: Hi, we at doo.net are using clojure and clojurescript for all our backend and web development. We are also still in need for clojure developers. :) Florian 2013/6/19 Nikita Prokopov prok...@gmail.com javascript: We're using Clojure for a year in one of our backend project (real-time social feeds aggregation processing) at AboutEcho.com (Novosibirsk Ulyanovsk, Russia). 1.5.1 + a little bit of ClojureScript for internal dashboard. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/groups/opt_out. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
What the recommended way now to create an instance and override its methods?
Hi, I know we usually use 'proxy' macro when we want to create an instance of a concrete class and override some of its methods. But do we have now a recommended approach? AFAIK, reify only works with protocols and interfaces, can't be used to create an instance and override its methods. I'm a little bit worry about 'proxy' macros since some devs are saying that it has a performance penalty. Thanks for help and time. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: First day with Macros
I don't get why we have to use a second 'back tick'. I thought one backtick at the beginning and then we use ~ and ~@ when needed. On Tuesday, June 18, 2013 2:09:44 AM UTC+2, Carlo wrote: I can't speak to the issues that Gary raised, but I can help you with your macro. (defmacro servlet [servlet-name meths] `(reify Servlet ~@(for [meth meths] (let [[method-name args body] meth method-name (hyphenated-camel-case method-name)] `(~method-name ~args ~@body) The key here is to keep track of when things are run. The `for` must be run at compile time in order to generate the code we want, so we have to escape it with ~@. The code that the `for` creates (in the form of a list) must then be (quasi-)quoted again by the backtick. Macros certainly take some getting used to. On Tue, Jun 18, 2013 at 8:12 AM, Hussein B. hubag...@gmail.comjavascript: wrote: Here is my fourth attempt: (defmacro servlet [servlet-name meths] `(reify Servlet (for [meth ~meths] (let [[method-name args body] ~meth camel-case-method-name (hyphenated-camel-case ~method-name)] (camel-case-method-name ~args ~@body) Still it is not working :( How to fix it? On Tuesday, June 18, 2013 12:04:50 AM UTC+2, Gary Trakhman wrote: Unquoting 'camel-case-method-name' is going to try and replace the symbol with it's value during compile-time in the context of the macro itself. also, reify isn't going to work if you need a named class to actually wire up your servlet, for example with a web.xml. Also, consider that you'll need some AOT compilation for the container to actually see the servlet class. On Mon, Jun 17, 2013 at 4:38 PM, Hussein B. hubag...@gmail.com wrote: Hi, My target is to have something like this: (servlet ArticlesServlet (do-get [this request response] (println Get Request)) (do-post [this request response] (println Post Request))) I started with this: (defmacro servlet [servlet-name meths] `(reify Servlet (for [meth ~@meths] (let [[method-name params body] meth camel-case-method-name (hyphenated-camel-case method-name)] (~camel-case-method-name ~@body) But of course, it is not working :) I get: CompilerException java.lang.RuntimeException: Unable to resolve symbol: camel-case-method-name in this context Why? And of course, feel super free to correct my Macro :) Thanks for help and time. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@**googlegroups.com For more options, visit this group at http://groups.google.com/**group/clojure?hl=enhttp://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@**googlegroups.com. For more options, visit https://groups.google.com/**groups/opt_outhttps://groups.google.com/groups/opt_out . -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/groups/opt_out. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: What the recommended way now to create an instance and override its methods?
Since reify allows us to override methods of an object, it is better to do: (def meh-object (MehClass.)) (reify meh-object ;; override methods) than: (proxy MehClass[] ;; override methods) Thanks. On Tuesday, June 18, 2013 1:16:40 PM UTC+2, Jim foo.bar wrote: On 18/06/13 08:45, Hussein B. wrote: I know we usually use 'proxy' macro when we want to create an instance of a concrete class and override some of its methods. But do we have now a recommended approach? 'proxy' is the recommended approach unless you have some weird overriding requirements like providing an override based on the type of the arguments rather than the arity, in which case you have to drop to Java and manually construct your proxy... yes, 'reify' will be slightly faster but as you say it only works with abstractions and not concrete objects. hope that helps, :) Jim -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: What the recommended way now to create an instance and override its methods?
Hmm, then why Clojure docs http://clojuredocs.org/clojure_core/clojure.core/reify mentions 'object': protocol-or-interface-or-Object (methodName [args+] body)* On Tuesday, June 18, 2013 1:41:57 PM UTC+2, Jim foo.bar wrote: On 18/06/13 12:34, Hussein B. wrote: Since reify allows us to override methods of an object, it is better to do: 'reify' allows you to* implement*/*satisfy* interface-methods - not to override concrete ones. user= (reify String #_= (length [this] (count this))) user= CompilerException java.lang.IllegalArgumentException: only interfaces are supported, had: java.lang.String, compiling:(NO_SOURCE_PATH:1:1) Jim -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Clojure in production
According to their Jobs page, Doo is using Clojure to implement their backend and web application: https://doo.net/en/ On Monday, June 10, 2013 11:47:25 PM UTC+2, Plinio Balduino wrote: Hi there I'm writing a talk about Clojure in the real world and I would like to know, if possible, which companies are using Clojure for production or to make internal tools. Thank you Plínio Balduino -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
First day with Macros
Hi, My target is to have something like this: (servlet ArticlesServlet (do-get [this request response] (println Get Request)) (do-post [this request response] (println Post Request))) I started with this: (defmacro servlet [servlet-name meths] `(reify Servlet (for [meth ~@meths] (let [[method-name params body] meth camel-case-method-name (hyphenated-camel-case method-name)] (~camel-case-method-name ~@body) But of course, it is not working :) I get: CompilerException java.lang.RuntimeException: Unable to resolve symbol: camel-case-method-name in this context Why? And of course, feel super free to correct my Macro :) Thanks for help and time. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: First day with Macros
Here is my fourth attempt: (defmacro servlet [servlet-name meths] `(reify Servlet (for [meth ~meths] (let [[method-name args body] ~meth camel-case-method-name (hyphenated-camel-case ~method-name)] (camel-case-method-name ~args ~@body) Still it is not working :( How to fix it? On Tuesday, June 18, 2013 12:04:50 AM UTC+2, Gary Trakhman wrote: Unquoting 'camel-case-method-name' is going to try and replace the symbol with it's value during compile-time in the context of the macro itself. also, reify isn't going to work if you need a named class to actually wire up your servlet, for example with a web.xml. Also, consider that you'll need some AOT compilation for the container to actually see the servlet class. On Mon, Jun 17, 2013 at 4:38 PM, Hussein B. hubag...@gmail.comjavascript: wrote: Hi, My target is to have something like this: (servlet ArticlesServlet (do-get [this request response] (println Get Request)) (do-post [this request response] (println Post Request))) I started with this: (defmacro servlet [servlet-name meths] `(reify Servlet (for [meth ~@meths] (let [[method-name params body] meth camel-case-method-name (hyphenated-camel-case method-name)] (~camel-case-method-name ~@body) But of course, it is not working :) I get: CompilerException java.lang.RuntimeException: Unable to resolve symbol: camel-case-method-name in this context Why? And of course, feel super free to correct my Macro :) Thanks for help and time. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/groups/opt_out. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: How to write this in idiomatic Clojure code?
Why the use of map? function ? I don't get it. On Friday, November 16, 2012 8:08:40 AM UTC+2, lpetit wrote: (map #(seq (process-some-class-instance %)) (tree-seq map? :children input)) Sent from a smartphone, please excuse the brevity/typos. Le 16 nov. 2012 à 00:13, Hussein B. hubag...@gmail.com javascript: a écrit : Yes true. If it is leaf , do process-some-class-instance If it is not, then it could hold a collection of nodes and leafs (a mixture) Actually , I'm checking tree-seq but I don't know how to use it in my case. Any ideas ? On Friday, November 16, 2012 1:06:22 AM UTC+2, lpetit wrote: Am I right in guessing that your input is some kind of tree where Someclass instances are leafs and non-leaf nodes are represented by maps having a :children key? Sent from a smartphone, please excuse the brevity/typos. Le 15 nov. 2012 à 23:33, Hussein B. hubag...@gmail.com a écrit : Hi, Would you please help me to morph this to an idiomatic Clojure ? (defn crazy [input] (if (instance? SomeClass input) (seq (process-some-class-instance input)) (map crazy (:children input Thanks for help and time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com javascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
How to write this in idiomatic Clojure code?
Hi, Would you please help me to morph this to an idiomatic Clojure ? (defn crazy [input] (if (instance? SomeClass input) (seq (process-some-class-instance input)) (map crazy (:children input Thanks for help and time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: How to write this in idiomatic Clojure code?
The snippet I provided, is an idiomatic Clojure ?
On Friday, November 16, 2012 12:41:31 AM UTC+2, Jay Fields wrote:
That code is clear enough that I wouldn't feel obligated to change it
if I encountered it.
You could also
(defmulti crazy class)
(defmethod crazy SomeClass [input]
(seq (process-some-class-instance input))
(defmethod crazy :default [{:keys [children]}]
(map crazy children))
On Thu, Nov 15, 2012 at 5:33 PM, Hussein B. hubag...@gmail.comjavascript:
wrote:
Hi,
Would you please help me to morph this to an idiomatic Clojure ?
(defn crazy [input]
(if (instance? SomeClass input)
(seq (process-some-class-instance input))
(map crazy (:children input
Thanks for help and time.
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Re: How to write this in idiomatic Clojure code?
Yes true. If it is leaf , do process-some-class-instance If it is not, then it could hold a collection of nodes and leafs (a mixture) Actually , I'm checking tree-seq but I don't know how to use it in my case. Any ideas ? On Friday, November 16, 2012 1:06:22 AM UTC+2, lpetit wrote: Am I right in guessing that your input is some kind of tree where Someclass instances are leafs and non-leaf nodes are represented by maps having a :children key? Sent from a smartphone, please excuse the brevity/typos. Le 15 nov. 2012 à 23:33, Hussein B. hubag...@gmail.com javascript: a écrit : Hi, Would you please help me to morph this to an idiomatic Clojure ? (defn crazy [input] (if (instance? SomeClass input) (seq (process-some-class-instance input)) (map crazy (:children input Thanks for help and time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com javascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Understanding clojure.core.cache TTL cache
Just to push to the limit.
Lets say we saved/serializer the cache to a secondary storage (file or
ZooKeeper).
What happen when the cache is restored?
I mean TTL is still honored? expired data while been sleeping will be
evicted upon an operation is performed after deserialization?
Thanks a lot!
On Tuesday, October 23, 2012 1:42:28 AM UTC+3, Sean Corfield wrote:
On Mon, Oct 22, 2012 at 3:30 PM, Hussein B. hubag...@gmail.comjavascript:
wrote:
So we need to call evict explicitly if we want to remove an entry? no
automatic deletion after expiring?
The cache is immutable.
When you call hit / miss, you get a new instance of the cache with the
expired entries removed, and the hit entry updated (if appropriate) or
the miss entry added.
That new instance needs to be stored somewhere (or passed to future
code execution).
Entries will be automatically deleted after expiring in any new
instance of the cache - returned by hit / miss.
You can see that here:
user= (swap! c3 hit-or-miss :a 1)
{:a 1}
user= (swap! c3 hit-or-miss :b 2)
{:a 1, :b 2}
user= (swap! c3 hit-or-miss :c 3)
{:c 3, :b 2}
user= (swap! c3 hit-or-miss :d 4)
{:c 3, :d 4}
user= (swap! c3 hit-or-miss :e 5)
{:c 3, :d 4, :e 5}
We add :a, then :b. By the time we add :c, :a has expired (and been
removed). By the time we add :d, :b has expired (and been removed).
Then we add :e before any more expiries. If I wait awhile and add a
new value for :a...
user= (swap! c3 hit-or-miss :a 6)
{:a 6}
...you'll see :c, :d and :e have expired.
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World Singles, LLC. -- http://worldsingles.com/
Perfection is the enemy of the good.
-- Gustave Flaubert, French realist novelist (1821-1880)
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Understanding clojure.core.cache TTL cache
Hi,
I created this:
(def c3 (cache/ttl-cache-factory {:a 1} :ttl 2))
user= c3
{:a 1}
user= (cache/has? c3 :a)
true
user= (cache/has? c3 :a)
false
user= c3
{:a 1}
user= (cache/evict c3 :a)
{}
user= c3
{:a 1}
After TTL, cache doesn't has :a entry but printing the var shows the map
contains :a
Then evicting :a shows {} but printing the c3 shows again the map contains
:a
What I'm missing?
Thanks for help and time
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Re: Understanding clojure.core.cache TTL cache
Wow, What an honor to get a reply from my idol and mentor !! Thanks a lot. I really appreciate to hear your opinion regarding this: http://stackoverflow.com/questions/13015906/is-it-safe-to-use-a-clojure-core-cache-guarded-by-ref-type Every thing started with this issue. Appreciate your precious time. On Monday, October 22, 2012 10:05:25 PM UTC+3, Fogus wrote: What I'm missing? First, thanks for trying c.c.cache! The answer to your question is that the TTL cache implementation is non-destructive. The `evict` call returns the cache without the element, but does not remove it from the original cache. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Understanding clojure.core.cache TTL cache
I see.
But I didn't really grasp the whole concept firmly .
c3 holds a map containing {:a 1} that will lives for two minutes.
After two minutes, requesting :a is generating false since it reached its
TTL but it will still live in map until it is removed explicitly by
invoking evict.
Correct?
Also, would you please explain the recommended pattern to use core.cache
for me?
(if (cache/has? C :c) ;; has? checks that the cache contains an item
(cache/hit C :c);; hit returns a cache with any relevant internal
information updated
(cache/miss C :c 42)) ;; miss returns a new cache with the new item and
without evicted entries
What I'm thinking of is a map that will remove an entry automatically
(without calling evict) after TTL.
Thanks a lot!
On Monday, October 22, 2012 11:15:06 PM UTC+3, Sean Corfield wrote:
On Mon, Oct 22, 2012 at 12:05 PM, Michael Fogus
mef...@gmail.comjavascript:
wrote:
First, thanks for trying c.c.cache! The answer to your question is
that the TTL cache implementation is non-destructive. The `evict`
call returns the cache without the element, but does not remove it
from the original cache.
In other words you need something like this:
(def c3 (atom (cache/ttl-cache-factory {:a 1} :ttl 2)))
user= @c3
{:a 1}
user= (cache/has? @c3 :a)
true
user= (cache/has? @c3 :a)
false
user= @c3
{:a 1}
user= (swap! c3 cache/evict :a)
{}
user= @c3
{}
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Re: Understanding clojure.core.cache TTL cache
I tried this:
(defn hit-or-miss
[a k v]
(if (c/has? @a k)
(c/hit @a k)
(c/miss @a k v)))
(def acu (atom (c/ttl-cache-factory {} :ttl 2)))
(swap! acu hit-or-miss :e 55)
But I got:
ClassCastException clojure.core.cache.TTLCache cannot be cast to
clojure.lang.IDeref clojure.core/deref (core.clj:2080)
Any ideas?
On Tuesday, October 23, 2012 1:03:10 AM UTC+3, Sean Corfield wrote:
Just to clarify, hit does nothing for TTL (since items timeout based
solely on when they were added, not when they were last touched), so
swap! on the hit really makes no difference here. It would, however,
be required for some of the other types of cache.
Also, exactly how you use has? / hit / miss is going to depend on how
you're interacting with the cache and what behavior you want.
For example, at World Singles, we use TTL caches and have three
operations:
* evict - this uses swap! and cache/evict to remove a cache entry
* fetch - this uses get to return an entry if present
* store - this uses swap! and cache/miss to add/update a cache entry
Since hit doesn't do anything on a TTL cache, we don't bother calling
it. If we switch to other types of cache, our fetch operation would
need to be updated to use cache/has?, swap! and cache/hit (as well as
get), or we'd need to change our API somewhat...
It's my understanding that you can use assoc / dissoc on a cache as
synonyms for miss / evict (that seemed to be true with the version of
core.cache that I initially used - I'm fairly confident it's still
true of assoc but not so confident that dissoc still works that way...
maybe Fogus can help me out there?).
Sean
On Mon, Oct 22, 2012 at 2:31 PM, Sean Corfield
seanco...@gmail.comjavascript:
wrote:
On Mon, Oct 22, 2012 at 1:50 PM, Hussein B.
hubag...@gmail.comjavascript:
wrote:
c3 holds a map containing {:a 1} that will lives for two minutes.
In the code I provided, c3 is an atom that holds a cache (which is the
map).
After two minutes, requesting :a is generating false since it reached
its
TTL but it will still live in map until it is removed explicitly by
invoking
evict.
Because the cache itself is immutable. That's why you need to store
the cache in an atom (so the atom can be updated to contain the
modified cache):
(defn hit-or-miss
Given an atom containing a cache, a key, and a value, update the
cache and return...
[a k v]
(if (cache/has? @a k)
(cache/hit @a k)
(cache/miss @a k v)))
... (swap! c3 hit-or-miss :c 42) ...
On Monday, October 22, 2012 11:15:06 PM UTC+3, Sean Corfield wrote:
In other words you need something like this:
(def c3 (atom (cache/ttl-cache-factory {:a 1} :ttl 2)))
user= @c3
{:a 1}
user= (cache/has? @c3 :a)
true
user= (cache/has? @c3 :a)
false
user= @c3
{:a 1}
user= (swap! c3 cache/evict :a)
{}
user= @c3
{}
--
Sean A Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/
World Singles, LLC. -- http://worldsingles.com/
Perfection is the enemy of the good.
-- Gustave Flaubert, French realist novelist (1821-1880)
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Re: Understanding clojure.core.cache TTL cache
I see, it works now.
So we need to call evict explicitly if we want to remove an entry? no
automatic deletion after expiring?
On Tuesday, October 23, 2012 1:21:54 AM UTC+3, Sean Corfield wrote:
On Mon, Oct 22, 2012 at 3:08 PM, Hussein B. hubag...@gmail.comjavascript:
wrote:
I tried this:
(defn hit-or-miss
[a k v]
(if (c/has? @a k)
(c/hit @a k)
(c/miss @a k v)))
My bad... got a bit carried away with the derefs based on code I was
playing around with in the REPL. Try this:
(defn hit-or-miss
[c k v]
(if (c/has? c k)
(c/hit c k)
(c/miss c k v)))
(swap! acu hit-or-miss :e 55)
That will update the atom to hold the new cache with {:e 55}.
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World Singles, LLC. -- http://worldsingles.com/
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Re: Understanding clojure.core.cache TTL cache
Thank you, I understand it :)
And thank you Mr. Fogus. What a great pleasure!
On Tuesday, October 23, 2012 1:42:28 AM UTC+3, Sean Corfield wrote:
On Mon, Oct 22, 2012 at 3:30 PM, Hussein B. hubag...@gmail.comjavascript:
wrote:
So we need to call evict explicitly if we want to remove an entry? no
automatic deletion after expiring?
The cache is immutable.
When you call hit / miss, you get a new instance of the cache with the
expired entries removed, and the hit entry updated (if appropriate) or
the miss entry added.
That new instance needs to be stored somewhere (or passed to future
code execution).
Entries will be automatically deleted after expiring in any new
instance of the cache - returned by hit / miss.
You can see that here:
user= (swap! c3 hit-or-miss :a 1)
{:a 1}
user= (swap! c3 hit-or-miss :b 2)
{:a 1, :b 2}
user= (swap! c3 hit-or-miss :c 3)
{:c 3, :b 2}
user= (swap! c3 hit-or-miss :d 4)
{:c 3, :d 4}
user= (swap! c3 hit-or-miss :e 5)
{:c 3, :d 4, :e 5}
We add :a, then :b. By the time we add :c, :a has expired (and been
removed). By the time we add :d, :b has expired (and been removed).
Then we add :e before any more expiries. If I wait awhile and add a
new value for :a...
user= (swap! c3 hit-or-miss :a 6)
{:a 6}
...you'll see :c, :d and :e have expired.
--
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An Architect's View -- http://corfield.org/
World Singles, LLC. -- http://worldsingles.com/
Perfection is the enemy of the good.
-- Gustave Flaubert, French realist novelist (1821-1880)
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Would you please help in migrating this code from Bishop to Liberator?
Hi,
I want to migrate this code written in Bishop REST framework to Liberator
REST framework:
(bishop/defresource ticket
{
text/html
(fn [request]
(let [request-method (:request-method request)]
(case request-method
:get (list-all-tickets request)
:post (create-ticket-per-uploaded-file request
}
{
:allowed-methods (fn [request] [:get :post])
})
I'm not really digesting the liberator approach.
Thanks for help and time.
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Immutability rules when it comes to Ref type
Hi, I have a ref type that wraps a map, this map is going to embed many nested other maps. According to immutability rules, what happens when: A new nested map is updated (entry is removed or update) or even a new nested map is added to the master map that is wrapped by ref type? Thanks for help and time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Immutability rules when it comes to Ref type
Crystal clear, thanks. On Friday, August 10, 2012 10:16:19 PM UTC+3, Andy Fingerhut wrote: Hussein: If you ignore the ref for the moment, making any change to a map, or a map nested inside a map however many levels deep you wish, does not mutate the original map. Instead it creates a brand new map with the new set of keys and values. It is as if the original was copied, and the copy was modified, but it is implemented much more efficiently than that. For efficiency, this new map will usually share a lot of memory with the original one, but the original one and the new one are both in memory and accessible simultaneously, until and unless one is garbage collected, which would only happen after no other data structure references it any longer. A ref effectively contains a pointer to one object at a time, and this pointer can change over time. If you want to be safe about concurrency, the ref should only ever point at an immutable data structure. Modifying the map pointed to by the ref merely means that the pointer is changed from pointing to one immutable map, to pointing at a different immutable map. Neither of the two maps becomes mutable as a result of this. Andy On Aug 10, 2012, at 9:21 AM, Hussein B. wrote: Hi, I have a ref type that wraps a map, this map is going to embed many nested other maps. According to immutability rules, what happens when: A new nested map is updated (entry is removed or update) or even a new nested map is added to the master map that is wrapped by ref type? Thanks for help and time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Better ideas how to collect analytics data
Hi, I'm collecting analytics data. I used a master map that holds many other nested maps. Considering maps are immutable, many new maps are going to be allocated. (Yes, that is efficient in Clojure). Basic operation that I'm using is update-in , very convenient. Do you have a better idea how to collect these data more efficiently in Clojure? Thanks for help and time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Why Clojure map literal creates an instance of array map?
Hi, Why Clojure map literal creates an instance of array map but not hash map? What are the advantages of array map over hash map? Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
How to measure pieces of Clojure code?
Hi, I want to measure how much space an algorithm is taking and then trying to change some aspects to see how things are going to differ. I also want to measure how much time it takes to complete an operation. What tools can I use? Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Why Clojure map literal creates an instance of array map?
Thanks, never knew about this hashtable threshold factor.
On Saturday, August 11, 2012 1:01:02 AM UTC+3, Tamreen Khan (Scriptor)
wrote:
It's not dependent on whether it's a literal but on the size of the map, 8
key-value pairs is the threshold.
This results in a PersistentHashMap
(class {1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9}) =
clojure.lang.PersistentHashMap
This gets you a PersistentArrayMap
(class {1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8}) =
clojure.lang.PersistentHashMap
You can see where this happens in the source here:
https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/PersistentArrayMap.java#L115
HASHTABLE_THRESHOLD is a constant set to 16, 8 keys and 8 values. So when
you assoc onto an arraymap with 8 key-value pairs it returns a hashmap.
The reason for this, as far as I understand it, is that with small
hashmaps it's more efficient to do simple copy-on-write. In other words
when you assoc onto it, it copies the entire map, adds the new key-value
pair to the copy, and then returns the copy. With larger hashmaps, it
becomes more useful to do use a more complicated tree structure which uses
structural sharing so that assoc doesn't copy the entire map. Copying a
small 5 element map isn't a big deal, but copying one with several thousand
elements is.
On Fri, Aug 10, 2012 at 5:43 PM, Hussein B. hubag...@gmail.comjavascript:
wrote:
Hi,
Why Clojure map literal creates an instance of array map but not hash map?
What are the advantages of array map over hash map?
Thanks.
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