morph's incomplete because it extends Functor only for collections and
function composition; I'll add String and boxed types, but for now Long's
extension must be supplied:
(use 'blancas.morph.core)
(extend-type java.lang.Long Functor (fun [this f] (f this)))
With this, it's like alto.generic but fmap comes curried:
user=> (fmap inc {:a 3 :b 9 :c 16})
{:a 4, :c 17, :b 10}
user=> (fmap (fmap inc) {:a {:b 9 :c 16} :d 25})
{:a {:c 17, :b 10}, :d 26}
For use with arbitrarily nested maps something like this is needed:
(defn f [k] (fn g [x] (if (map? x) (fmap g x) (k x))))
user=> (fmap (f inc) {:a {:b 9 :c {:x 16 :y 20}} :d 25})
{:a {:c {:y 21, :x 17}, :b 10}, :d 26}
On Friday, July 26, 2013 9:31:41 PM UTC-7, Ben wrote:
>
> On Fri, Jul 26, 2013 at 9:27 PM, Yoshinori Kohyama
> <[email protected]<javascript:>
> > wrote:
>
>> Thank you, Ben.
>>
>> If I think the map as a tree, then as a functor, what I do is 'fmap' (in
>> Haskell or some languages),
>> ,as you say.
>> Thanks for saying that.
>>
>> Does Algo supply things around Functor, Applicative and Monad?
>> I'm going to look at Algo.
>>
>> Or anybody knows any other libraries or implementations around these
>> things in Clojure?
>>
>>
> algo.generic has a functor implementation for regular maps which you could
> already use, if your maps have uniform depth:
>
> (fmap (partial fmap inc) {:a {:x 1} :b {:y 2}}) ---> {:a {:x 2} :b {:y 3}}
>
> if you want to use that fmap (or, I'd think, the fmaps provided by either
> morph or fluokitten) with uneven depths, you'd have to wrap them in a
> defrecord or deftype, I'd expect.
>
> --
> 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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