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flatMap 的示例有误 #153

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zhuweiyou opened this issue Sep 28, 2018 · 0 comments
Open

flatMap 的示例有误 #153

zhuweiyou opened this issue Sep 28, 2018 · 0 comments

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@zhuweiyou
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@zhuweiyou zhuweiyou commented Sep 28, 2018 •
edited

https://github.com/InterviewMap/CS-Interview-Knowledge-Map/blob/master/JS/JS-en.md#mapflatmap-and-reduce

[1, [2], 3].flatMap((v) => v + 1)
// -> [2, 3, 4]

上面这个，运行结果是不正确的，而且没有表达 flatMap 的作用
应该是类似这样

const arr = [1, 2, 3, 4]
arr.map(x => [x * 2])
// [[2], [4], [6], [8]]

arr.flatMap(x => [x * 2])
// [2, 4, 6, 8]
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