Re: Future of spec/explain-data, spec/and, etc.
On Sunday, July 24, 2016 at 10:40:41 PM UTC-5, Mars0i wrote:
>
> spec/explain-data seems very important. It allows programmatic responses
> to spec failures. Maybe explain-data's behavior hasn't yet stabilized,
> though? The structure of the return value has changed between 1.9.0-alpha7
> to the current 1.9.0-alpha10, the docstring is a bit vague, and the Spec
> Guide only talks about it very briefly.
>
explain-data is not in flux but as we are in alpha, it could still change.
:path are path tags
:via are specs
:in are data keys
At present, it's easy to figure out which test(s) has/have failed by
> examining the :path value(s) in explain-data's return value in some
> situations, such as when specs are combined using spec/keys or spec/or. In
> other situations--at least when specs are combined with spec/and, the:path
> values are empty. Unlike spec/or, there's no way to specify keywords that
> would identify the failed test.
>
> Am I right that explain-data is in flux? Is the goal that in the future,
> it will always be possible for developers to specify composite specs in
> such a way that explain-data can return info that identifies the failed
> test clearly? For example, in the first spec/and illustration below, maybe
> explain-data could use the names of the component specs as path elements?
> (Or am I just confused about something?)
>
As specs, the component spec path is recorded in :via.
>
> Thanks-
>
> Example, using Clojure 1.9.0-alpha10:
>
> (s/def ::even even?)
> (s/def ::zero-to-ten (s/int-in 0 10)) ; require number from 0 to 10
> inclusive
>
> user=> (s/explain-data (s/or :pred1 ::even :pred2 ::zero-to-ten) 11)
> {:clojure.spec/problems
> ({:path [:pred1], :pred even?, :val 11, :via [:user/even], :in []}
> {:path [:pred2],
>:pred (int-in-range? 0 10 %),
>:val 11,
>:via [:user/zero-to-ten],
>:in []})}
>
> ;; Note that the format of the path entries are different above and below.
> ;; Is there a reason for this difference, or will later versions return
> ;; the same path elements?
>
Both examples seem consistent with my prior description of the data (specs
in :via, paths in :path, and data keys in :in). They are specs with
different structure so I would not expect them to yield the same explain
results.
> user=> (s/explain-data (s/keys :req-un [::even ::zero-to-ten]) {:even 11
> :zero-to-ten 11})
> {:clojure.spec/problems
> ({:path [:even], :pred even?, :val 11, :via [:user/even], :in [:even]}
> {:path [:zero-to-ten],
>:pred (int-in-range? 0 10 %),
>:val 11,
>:via [:user/zero-to-ten],
>:in [:zero-to-ten]})}
>
> ;; Here there's nothing in the :path or :in sequences, although :via
> provides some information:
>
Yes, as expected.
> user=> (s/explain-data (s/and ::even ::zero-to-ten) 11)
> #:clojure.spec{:problems [{:path [], :pred even?, :val 11, :via
> [:user/even], :in []}]}
>
> ;; Note that only the first failed test is identified, which makes sense.
>
>
> ;; Another s/and example, with no info other than the value of :pred to
> indicate what test failed:
>
What other info could be provided? You have the predicate and the invalid
value. If you had named the predicate, you would have more info.
user=> (s/explain-data (s/and even? (s/int-in 0 10)) 11)
> #:clojure.spec{:problems [{:path [], :pred even?, :val 11, :via [], :in
> []}]}
>
user=> (s/def ::even even?)
:user/even
user=> (s/def ::irange (s/int-in 0 10))
:user/irange
user=> (s/explain-data (s/and ::even ::irange) 11)
#:clojure.spec{:problems [{:path [], :pred even?, :val 11, :via
[:user/even], :in []}]}
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Future of spec/explain-data, spec/and, etc.
spec/explain-data seems very important. It allows programmatic responses
to spec failures. Maybe explain-data's behavior hasn't yet stabilized,
though? The structure of the return value has changed between 1.9.0-alpha7
to the current 1.9.0-alpha10, the docstring is a bit vague, and the Spec
Guide only talks about it very briefly.
At present, it's easy to figure out which test(s) has/have failed by
examining the :path value(s) in explain-data's return value in some
situations, such as when specs are combined using spec/keys or spec/or. In
other situations--at least when specs are combined with spec/and, the:path
values are empty. Unlike spec/or, there's no way to specify keywords that
would identify the failed test.
Am I right that explain-data is in flux? Is the goal that in the future,
it will always be possible for developers to specify composite specs in
such a way that explain-data can return info that identifies the failed
test clearly? For example, in the first spec/and illustration below, maybe
explain-data could use the names of the component specs as path elements?
(Or am I just confused about something?)
Thanks-
Example, using Clojure 1.9.0-alpha10:
(s/def ::even even?)
(s/def ::zero-to-ten (s/int-in 0 10)) ; require number from 0 to 10
inclusive
user=> (s/explain-data (s/or :pred1 ::even :pred2 ::zero-to-ten) 11)
{:clojure.spec/problems
({:path [:pred1], :pred even?, :val 11, :via [:user/even], :in []}
{:path [:pred2],
:pred (int-in-range? 0 10 %),
:val 11,
:via [:user/zero-to-ten],
:in []})}
;; Note that the format of the path entries are different above and below.
;; Is there a reason for this difference, or will later versions return
;; the same path elements?
user=> (s/explain-data (s/keys :req-un [::even ::zero-to-ten]) {:even 11
:zero-to-ten 11})
{:clojure.spec/problems
({:path [:even], :pred even?, :val 11, :via [:user/even], :in [:even]}
{:path [:zero-to-ten],
:pred (int-in-range? 0 10 %),
:val 11,
:via [:user/zero-to-ten],
:in [:zero-to-ten]})}
;; Here there's nothing in the :path or :in sequences, although :via
provides some information:
user=> (s/explain-data (s/and ::even ::zero-to-ten) 11)
#:clojure.spec{:problems [{:path [], :pred even?, :val 11, :via
[:user/even], :in []}]}
;; Note that only the first failed test is identified, which makes sense.
;; Another s/and example, with no info other than the value of :pred to
indicate what test failed:
user=> (s/explain-data (s/and even? (s/int-in 0 10)) 11)
#:clojure.spec{:problems [{:path [], :pred even?, :val 11, :via [], :in
[]}]}
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Re: Exception : cannot create ISeq from Long when empty list is present.. ?
"solve" is a recursive function that expects a collection of mazes to be returned. By adding "first" you change the return type, stripping off a layer each recursive call until you get integers instead of vectors. - James On 24 July 2016 at 08:32, Ashish Negi wrote: > the code throwing exceptions is below it : > https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L76 > > -- > 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. > -- 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: Exception : cannot create ISeq from Long when empty list is present.. ?
the code throwing exceptions is below it : https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L76 -- 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.
Exception : cannot create ISeq from Long when empty list is present.. ?
I am writing a soduku solver.. Everything works but since i am interested
in first solution.. when i write `first` after
https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L58
I get
{:type java.lang.IllegalArgumentException
;; :message "Don't know how to create ISeq from: java.lang.Long"
;; :at [clojure.lang.RT seqFrom "RT.java" 542]}
though printing the argument gives me..
; "value: " () " class: " clojure.lang.LazySeq
at
https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L786
Please see full stack trace at :
https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L88
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