ut2/es/isEmpty.js

一个现代 JavaScript 实用工具库。[点击查看在线文档]。

import getTag from './internals/getTag.js';
import { mapTag, setTag } from './internals/native.js';
import isArrayLike from './isArrayLike.js';
import isNil from './isNil.js';
import isObjectLike from './isObjectLike.js';
import allKeys from './allKeys.js';

function isEmpty(value) {
    if (isNil(value)) {
        return true;
    }
    var tag = getTag(value);
    if (tag === mapTag || tag === setTag) {
        return !value.size;
    }
    if (isObjectLike(value)) {
        return !allKeys(value).length;
    }
    if (isArrayLike(value)) {
        return !value.length;
    }
    return true;
}

export { isEmpty as default };