以功能性风格将elem与下一个加入 [英] Join elem with next one in a functional style

问题描述

我正在尝试找到一种方法来加入"/分组"列表中的2个元素，如下所示:

I'm trying to find a way to "join"/"groupby" 2 elements in a list as following :

List("a","b","c","d")  -> List("ab","bc","cd")

具有实用风格.

有人知道该怎么做吗?

Would someone know how to do this?

需要使用缩小器，折叠，扫描和其他高阶功能吗?

Need I use reducer, fold, scan, other higher-order function?

推荐答案

Sliding creates subcollections with sliding window, then you just need to map this sublists to strings:

List("a","b","c","d").sliding(2,1).map{case List(a,b) => a+b}

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