Re: merge nested maps
The implementation(s) acts a bit counter-intuitive on non-nested maps:
FAIL in (deep-merge-test) (test.clj:5)
expected: (= (merge {:a 1, :d 1} {:a 2, :c 1}) (deep-merge {:a 1, :d 1} {:a
2, :c 1}))
actual: (not (= {:c 1, :a 2, :d 1} {:a 2, :c 1}))
ERROR in (deep-merge-with-test) (Numbers.java:942)
expected: (= nil (deep-merge-with + nil nil nil))
actual: java.lang.NullPointerException: null
On Wednesday, July 17, 2013 8:53:03 PM UTC+2, JvJ wrote:
By the way, this is already in contrib:
http://clojuredocs.org/clojure_contrib/clojure.contrib.map-utils/deep-merge-with
On Wednesday, July 17, 2013 5:42:24 AM UTC-7, Chris Gill wrote:
Thank you for finding and posting this! Been wracking my brain trying to
figure out a good way to do a full map merge
On Thursday, April 25, 2013 5:26:53 PM UTC-4, Stuart Sierra wrote:
Here's a way to do it from the Pedestal demo source
codehttps://github.com/pedestal/demo/blob/17eeac7a5e50d31eb81901de465f3f1d863f2f01/hammock-cafe/src/hammock_cafe/config.clj#L37
:
(defn deep-merge
Recursively merges maps. If keys are not maps, the last value wins.
[ vals]
(if (every? map? vals)
(apply merge-with deep-merge vals)
(last vals)))
-S
On Thursday, April 25, 2013 4:41:33 PM UTC-4, Joachim De Beule wrote:
Hi list,
I was searching for an easy way to combined nested maps, e.g. as in
(combine {:foo {:bar baz}} {:foo {:x y}})
= {:foo {:bar baz, :x y}}
I would expect that there is some core map operation to do this, but
neither merge nor unify work as they simply return {:foo {:x y}}, and I
don't see anything else. Am I missing something?
Joachim.
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Re: merge nested maps
Thank you for finding and posting this! Been wracking my brain trying to
figure out a good way to do a full map merge
On Thursday, April 25, 2013 5:26:53 PM UTC-4, Stuart Sierra wrote:
Here's a way to do it from the Pedestal demo source
codehttps://github.com/pedestal/demo/blob/17eeac7a5e50d31eb81901de465f3f1d863f2f01/hammock-cafe/src/hammock_cafe/config.clj#L37
:
(defn deep-merge
Recursively merges maps. If keys are not maps, the last value wins.
[ vals]
(if (every? map? vals)
(apply merge-with deep-merge vals)
(last vals)))
-S
On Thursday, April 25, 2013 4:41:33 PM UTC-4, Joachim De Beule wrote:
Hi list,
I was searching for an easy way to combined nested maps, e.g. as in
(combine {:foo {:bar baz}} {:foo {:x y}})
= {:foo {:bar baz, :x y}}
I would expect that there is some core map operation to do this, but
neither merge nor unify work as they simply return {:foo {:x y}}, and I
don't see anything else. Am I missing something?
Joachim.
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Re: merge nested maps
By the way, this is already in contrib:
http://clojuredocs.org/clojure_contrib/clojure.contrib.map-utils/deep-merge-with
On Wednesday, July 17, 2013 5:42:24 AM UTC-7, Chris Gill wrote:
Thank you for finding and posting this! Been wracking my brain trying to
figure out a good way to do a full map merge
On Thursday, April 25, 2013 5:26:53 PM UTC-4, Stuart Sierra wrote:
Here's a way to do it from the Pedestal demo source
codehttps://github.com/pedestal/demo/blob/17eeac7a5e50d31eb81901de465f3f1d863f2f01/hammock-cafe/src/hammock_cafe/config.clj#L37
:
(defn deep-merge
Recursively merges maps. If keys are not maps, the last value wins.
[ vals]
(if (every? map? vals)
(apply merge-with deep-merge vals)
(last vals)))
-S
On Thursday, April 25, 2013 4:41:33 PM UTC-4, Joachim De Beule wrote:
Hi list,
I was searching for an easy way to combined nested maps, e.g. as in
(combine {:foo {:bar baz}} {:foo {:x y}})
= {:foo {:bar baz, :x y}}
I would expect that there is some core map operation to do this, but
neither merge nor unify work as they simply return {:foo {:x y}}, and I
don't see anything else. Am I missing something?
Joachim.
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Re: merge nested maps
Shouldn't that docstring read If vals are not maps ?
On 25 April 2013 23:26, Stuart Sierra the.stuart.sie...@gmail.com wrote:
Here's a way to do it from the Pedestal demo source code:
(defn deep-merge
Recursively merges maps. If keys are not maps, the last value wins.
[ vals]
(if (every? map? vals)
(apply merge-with deep-merge vals)
(last vals)))
-S
On Thursday, April 25, 2013 4:41:33 PM UTC-4, Joachim De Beule wrote:
Hi list,
I was searching for an easy way to combined nested maps, e.g. as in
(combine {:foo {:bar baz}} {:foo {:x y}})
= {:foo {:bar baz, :x y}}
I would expect that there is some core map operation to do this, but
neither merge nor unify work as they simply return {:foo {:x y}}, and I
don't see anything else. Am I missing something?
Joachim.
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Re: merge nested maps
Yes.
On Sun, Apr 28, 2013 at 4:55 AM, Gary Verhaegen gary.verhae...@gmail.comwrote:
Shouldn't that docstring read If vals are not maps ?
On 25 April 2013 23:26, Stuart Sierra the.stuart.sie...@gmail.com wrote:
Here's a way to do it from the Pedestal demo source code:
(defn deep-merge
Recursively merges maps. If keys are not maps, the last value wins.
[ vals]
(if (every? map? vals)
(apply merge-with deep-merge vals)
(last vals)))
-S
On Thursday, April 25, 2013 4:41:33 PM UTC-4, Joachim De Beule wrote:
Hi list,
I was searching for an easy way to combined nested maps, e.g. as in
(combine {:foo {:bar baz}} {:foo {:x y}})
= {:foo {:bar baz, :x y}}
I would expect that there is some core map operation to do this, but
neither merge nor unify work as they simply return {:foo {:x y}}, and
I
don't see anything else. Am I missing something?
Joachim.
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merge nested maps
Hi list,
I was searching for an easy way to combined nested maps, e.g. as in
(combine {:foo {:bar baz}} {:foo {:x y}})
= {:foo {:bar baz, :x y}}
I would expect that there is some core map operation to do this, but
neither merge nor unify work as they simply return {:foo {:x y}}, and I
don't see anything else. Am I missing something?
Joachim.
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Re: merge nested maps
On Apr 25, 2013, at 15:41 , Joachim De Beule joachim.de.be...@gmail.com wrote:
I was searching for an easy way to combined nested maps, e.g. as in
(combine {:foo {:bar baz}} {:foo {:x y}})
= {:foo {:bar baz, :x y}}
user= (merge-with merge {:foo {:bar baz}} {:foo {:x y}})
{:foo {:x y, :bar baz}}
If you need to support more than one level of nesting, you could try something
like:
(defn combine [ maps]
(apply merge-with combine maps))
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Re: merge nested maps
Seems you want a cross between update-in and merge. Maybe something like
this?
(defn combine
Merge maps, recursively merging nested maps whose keys collide.
([] {})
([m] m)
([m1 m2]
(reduce (fn [m1 [k2 v2]]
(if-let [v1 (get m1 k2)]
(if (and (map? v1) (map? v2))
(assoc m1 k2 (combine v1 v2))
(assoc m1 k2 v2))
(assoc m1 k2 v2)))
m1 m2))
([m1 m2 more]
(apply combine (combine m1 m2) more)))
(warning: scarcely tested much)
On Thu, Apr 25, 2013 at 4:41 PM, Joachim De Beule
joachim.de.be...@gmail.com wrote:
Hi list,
I was searching for an easy way to combined nested maps, e.g. as in
(combine {:foo {:bar baz}} {:foo {:x y}})
= {:foo {:bar baz, :x y}}
I would expect that there is some core map operation to do this, but
neither merge nor unify work as they simply return {:foo {:x y}}, and I
don't see anything else. Am I missing something?
Joachim.
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Re: merge nested maps
It was fun to try a naive implementation
(defn combine [m1 m2]
(let [mm1 (transient m1)]
(do
(doseq [k (keys m2)]
(if (contains? m1 k)
(assoc! mm1 k (conj (mm1 k) (m2 k)))
(assoc! mm1 k (m2 k
(persistent! mm1
On 25/04/13 16:29, Cedric Greevey wrote:
Seems you want a cross between update-in and merge. Maybe something
like this?
(defn combine
Merge maps, recursively merging nested maps whose keys collide.
([] {})
([m] m)
([m1 m2]
(reduce (fn [m1 [k2 v2]]
(if-let [v1 (get m1 k2)]
(if (and (map? v1) (map? v2))
(assoc m1 k2 (combine v1 v2))
(assoc m1 k2 v2))
(assoc m1 k2 v2)))
m1 m2))
([m1 m2 more]
(apply combine (combine m1 m2) more)))
(warning: scarcely tested much)
On Thu, Apr 25, 2013 at 4:41 PM, Joachim De Beule
joachim.de.be...@gmail.com mailto:joachim.de.be...@gmail.com wrote:
Hi list,
I was searching for an easy way to combined nested maps, e.g. as in
(combine {:foo {:bar baz}} {:foo {:x y}})
= {:foo {:bar baz, :x y}}
I would expect that there is some core map operation to do this,
but neither merge nor unify work as they simply return {:foo {:x
y}}, and I don't see anything else. Am I missing something?
Joachim.
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Re: merge nested maps
Here's a way to do it from the Pedestal demo source
codehttps://github.com/pedestal/demo/blob/17eeac7a5e50d31eb81901de465f3f1d863f2f01/hammock-cafe/src/hammock_cafe/config.clj#L37
:
(defn deep-merge
Recursively merges maps. If keys are not maps, the last value wins.
[ vals]
(if (every? map? vals)
(apply merge-with deep-merge vals)
(last vals)))
-S
On Thursday, April 25, 2013 4:41:33 PM UTC-4, Joachim De Beule wrote:
Hi list,
I was searching for an easy way to combined nested maps, e.g. as in
(combine {:foo {:bar baz}} {:foo {:x y}})
= {:foo {:bar baz, :x y}}
I would expect that there is some core map operation to do this, but
neither merge nor unify work as they simply return {:foo {:x y}}, and I
don't see anything else. Am I missing something?
Joachim.
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