javascript：通过索引从数组中获取子数组 [英] javascript: get subarray from an array by indexes

问题描述

是否有单行代码通过索引从数组中获取子数组？

例如，假设我想获得 [ a，c，e] 来自 [a，b，c，d，e] by [0,2,4] 。如何使用单行代码执行此操作？类似 [a，b，c，d，e] [0,2,4] ..

解决方案

您可以使用 map ;

< pre class =snippet-code-js lang-js prettyprint-override> var array1 = [a，b，c]; var array2 = [0,2]; var array3 = array2.map（i => array1 [i]）; console.log（array3）;

Is there a one-line code to get an subarray from an array by index?

For example, suppose I want to get ["a","c","e"] from ["a","b","c","d","e"] by [0,2,4]. How to do this with a one-line code? Something like ["a","b","c","d","e"][0,2,4]..

解决方案

You could use map;

var array1 = ["a","b","c"];
var array2 = [0,2];
var array3 = array2.map(i => array1[i]);
console.log(array3);

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