确定一个数组是否包含JavaScript / CoffeeScript中另一个数组的内容 [英] Determining whether one array contains the contents of another array in JavaScript/CoffeeScript

问题描述

在JavaScript中，如何测试一个数组有另一个数组的元素？

In JavaScript, how do I test that one array has the elements of another array?

arr1 = [1, 2, 3, 4, 5]
[8, 1, 10, 2, 3, 4, 5, 9].function_name(arr1) # => true

推荐答案

做一个ad-hoc数组交集并检查长度。

No set function does this, but you can simply do an ad-hoc array intersection and check the length.

[8, 1, 10, 2, 3, 4, 5, 9].filter(function (elem) {
    return arr1.indexOf(elem) > -1;
}).length == arr1.length

更有效的方法是使用 .every falsey case。

A more efficient way to do this would be to use .every which will short circuit in falsey cases.

arr1.every(elem => arr2.indexOf(elem) > -1);

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