30秒学会 JavaScript 片段 – isArrayLike

Checks if the provided argument is array-like (i.e. is iterable).

Check if the provided argument is not null and that its Symbol.iterator property is a function.

代码片段

const isArrayLike = obj => obj != null && typeof obj[Symbol.iterator] === 'function';

使用样例

isArrayLike([1, 2, 3]); // true
isArrayLike(document.querySelectorAll('.className')); // true
isArrayLike('abc'); // true
isArrayLike(null); // false