locutus/php/var/empty.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.empty = empty;
function empty(mixedVar) {
    //  discuss at: https://locutus.io/php/empty/
    // original by: Philippe Baumann
    //    input by: Onno Marsman (https://twitter.com/onnomarsman)
    //    input by: LH
    //    input by: Stoyan Kyosev (https://www.svest.org/)
    // bugfixed by: Kevin van Zonneveld (https://kvz.io)
    // improved by: Onno Marsman (https://twitter.com/onnomarsman)
    // improved by: Francesco
    // improved by: Marc Jansen
    // improved by: Rafał Kukawski (https://blog.kukawski.pl)
    //   example 1: empty(null)
    //   returns 1: true
    //   example 2: empty(undefined)
    //   returns 2: true
    //   example 3: empty([])
    //   returns 3: true
    //   example 4: empty({})
    //   returns 4: true
    //   example 5: empty({'aFunc' : function () { alert('humpty'); } })
    //   returns 5: false
    const emptyValues = [undefined, null, false, 0, '', '0'];
    for (const emptyValue of emptyValues) {
        if (mixedVar === emptyValue) {
            return true;
        }
    }
    if (typeof mixedVar === 'object' && mixedVar !== null) {
        return Object.keys(mixedVar).length === 0;
    }
    return false;
}