FSharp功能组合 [英] FSharp Functional Composition

问题描述

我有三个这样的功能:

let functionA (i:int) =
    "functionA" + string i

let functionB (i:int) =
    "functionB" + string i

let functionC (i:int) =
    "functionC" + string i

我想将这些函数链接在一起，以便执行所有三个函数的结果是每个返回值的数组，有点像 Seq.Collect arrayOfFunctions

I want to chain these functions together such that the result of executing all three is an array of each of the return values, kind of like Seq.Collect arrayOfFunctions

有没有办法声明性地做到这一点?如果我将functionB的参数从int更改为float，答案是否会改变?

Is there a way to do this declaratively? If I change functionB's parameter from an int to a float, does the answer change?

谢谢

推荐答案

let farr = [| functionA; functionB; functionC |] 
let applyfarr farr i = Array.map (fun f -> f i) farr  

如何申请:

applyfarr farr 2 
> val it : string [] = [|"functionA2"; "functionB2"; "functionC2"|]

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