有什么办法可以简化这条线吗? [英] is there any way to simplify this line?

问题描述

if reelID = reelWeights.Count - 1
    then Array.fold calc1 (0L,0) reelWeights.[reelID]
    else Array.fold calc2 (0L,0) reelWeights.[reelID]

我尝试使用管道，它似乎有点慢了(不确定为什么):

I tried use pipeline, it seems to slow down a little bit (not sure why):

reelWeights.[reelID]
    |> (if reelID = reelWeights.Count - 1 then Array.fold calc1 else Array.fold calc2) (0L,0)

如果我愿意

let calc x = if x then calc1 else calc2
Array.fold (calc reelID = reelWeights.Count - 1) (0L,0) reelWeights.[reelID]

然后看起来不错，但要以循环方式冗余检查条件为代价.

then it looks nice at the cost of redundantly check conditionion in loops.

推荐答案

假定calc1和calc2具有相同的签名(或者，如果它们是值而不是函数，则具有相同的类型):

Assuming calc1 and calc2 have the same signature (or if they're values rather than functions, are the same type):

let calc = if reelID = reelWeights.Count - 1 then calc1 else calc2
Array.fold calc (0L, 0) reelWeights.[reelID]

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