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数组方法的扩展flat()和flatMap()
阅读量:586 次
发布时间:2019-03-11

本文共 587 字,大约阅读时间需要 1 分钟。

  • flat()将多维数组转化为低维数组
const arr = [1,2,3,4,[5,6]]console.log(arr.flat())        //[1, 2, 3, 4, 5, 6]const arr1 = [1,2,3,4,[5,6,[7,8,9]]]console.log(arr1.flat())       //[1, 2, 3, 4, 5, 6, [7,8,9]] //想将多维数组转成一维数组,则需要参数console.log(arr1.flat(2))      //[1, 2, 3, 4, 5, 6, 7, 8, 9]
  • flatMap()
const arr = [1,2,3,4,5]const result = arr.map(item => [item * 100])    console.log(result)     //返回一个二维数组,如下图

在这里插入图片描述

flatMap()方法将返回的这个二维数组转成一维数组

//flatMapconst arr = [1,2,3,4,5]const result = arr.flatMap(item => [item * 100])    console.log(result)      //[100, 200, 300, 400, 500]

flat()和flatMap()都是ES10中的新特性

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