juxt?
user=> (map (juxt zero? even?) (range 5))
([true true] [false false] [false true] [false false] [false true])
user=> (map (apply juxt [zero? even?]) (range 5))
([true true] [false false] [false true] [false false] [false true])
On Monday, November 17, 2014 8:25:07 PM UTC-8, Andy L wrote:
>
> Hi,
>
> This is another puzzle/exercise based on a very practical need. I could
> not find a built in function, hoping something like "colfn" already exists.
> Otherwise I wonder about an idiomatic solution. This is self-explanatory
> code:
>
> user=> (require '[clojure.algo.generic.functor :as fu])
> user=> (require '[me.raynes.fs :as fs])
>
> user=> (defn colfn[col] (fn [a] (fu/fmap #(% a) col)))
>
> user=> (map (colfn [fs/directory?,identity]) (filter fs/directory?(set
> (fs/list-dir "."))))
> ([true "src"] [true "target"] [true ".git"])
>
> user=> (map (colfn {:is-dir fs/directory?, :dir identity}) (filter
> fs/directory?(set (fs/list-dir "."))))
> ({:is-dir true, :dir "src"} {:is-dir true, :dir "target"} {:is-dir true,
> :dir ".git"})
>
>
> My question is, if something like colfn already exists? The idea is to
> generate a function of a sequence (vector, list, map) of functions which
> would used in e.g. map.
>
> Best,
> Andy
>
>
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