按条件替换列表中的元素 [英] Replace elements in List by condition

问题描述

我有一个很大的val s: List[Int] = //...，一个函数f: Int => Boolean和一个函数transform: Int => Int.

I have a pretty much large val s: List[Int] = //..., a function f: Int => Boolean and a function transform: Int => Int.

问题 :我想创建另一个List[Int]，以便将s: List[Int]的所有元素e: Int替换为.

The problem: I want to create another List[Int] such that all elements e: Int of the s: List[Int] such that f(e) = true are replaced with transform(e).

我看着cats-mtl

I looked at cats-mtl FunctorEmpty (to adhere to functional programming style), but it does not seem to work in my case. Maybe some cats/scalaz data structures can be useful here? Or any other way?

推荐答案

s.map{ e => if(f(e)) transform(e) else e }

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