按条件替换列表中的元素

本文介绍了按条件替换列表中的元素的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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 FunctorEmpty (坚持使用函数式编程风格)，但在我看来，它似乎不起作用.也许某些cats/scalaz数据结构在这里有用吗?还是其他方式?

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 }