If the map is a tree with values at the leaves, then it's a functor and
applying a function to the values is fmap.
On Fri, Jul 26, 2013 at 6:02 PM, Dave Sann <daves...@gmail.com> wrote:
> if you are thinking of the nested map as a sort of tree - which you seem
> to be doing - then map-leaves or something similar might convey the intent.
>
> On Saturday, 27 July 2013 04:30:30 UTC+10, Jay Fields wrote:
>>
>> I'm not sure I'd call this more readable, but it's another option - using
>> clojure.walk
>>
>> (defn deep-update-vals
>> [m f & args]
>> (let [f (fn [[k v]] (if (map? v) [k v] [k (apply f v args)]))]
>> (clojure.walk/postwalk (fn [x] (if (map? x) (into {} (map f x)) x))
>> m)))
>>
>>
>> On Fri, Jul 26, 2013 at 2:06 PM, Jay Fields <j...@jayfields.com> wrote:
>>
>>> I defined update-vals in jry: https://github.com/**
>>> jaycfields/jry/blob/master/**src/clojure/jry.clj#L74-L75<https://github.com/jaycfields/jry/blob/master/src/clojure/jry.clj#L74-L75>
>>>
>>> It doesn't traverse nested maps, but I haven't ever needed that ability
>>> either.
>>>
>>> 1) I've never seen a name for that.
>>> 2) not in core. I'm sure it's been written 50 times in various helper
>>> libs.
>>> 3) I'd probably write it like below, but I'm not convinced it's any
>>> better.
>>>
>>> (defn deep-update-vals
>>> [m f & args]
>>> (if (map? m)
>>> (reduce-kv #(assoc %1 %2 (apply deep-update-vals %3 f args)) {} m)
>>> (apply f m args)))
>>>
>>>
>>> On Fri, Jul 26, 2013 at 1:31 PM, Yoshinori Kohyama <yyko...@gmail.com>wrote:
>>>
>>>> Thank you Gary.
>>>> There's no reason why this need to be a macro.
>>>> It has rewritten as a function.
>>>>
>>>> And I'd still like to hear any response about the same three questions.
>>>>
>>>>
>>>>
>>>> (require '[clojure.test :refer (with-test is run-tests)])
>>>>
>>>>
>>>>
>>>> (with-test
>>>> (defn mapf [f m & args]
>>>>
>>>>
>>>> ((fn g [n]
>>>> (if (map? n)
>>>>
>>>>
>>>> (into {} (map (fn [[k v]] [k (g v)]) n))
>>>>
>>>>
>>>> (apply f n args)))
>>>>
>>>> m))
>>>>
>>>> (is (= (mapf #(* % %) {:a {:b 3 :c 4} :d 5})
>>>>
>>>>
>>>> {:a {:b 9 :c 16} :d 25}))
>>>>
>>>>
>>>> (is (= (mapf #(+ (* %1 %1) %2) {:a {:b 3 :c 4} :d 5} 1)
>>>>
>>>>
>>>> {:a {:b 10 :c 17} :d 26})))
>>>>
>>>>
>>>>
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>>>>
>>>
>>>
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--
Ben Wolfson
"Human kind has used its intelligence to vary the flavour of drinks, which
may be sweet, aromatic, fermented or spirit-based. ... Family and social
life also offer numerous other occasions to consume drinks for pleasure."
[Larousse, "Drink" entry]
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