Gecko [ fernandoquevedodop.com ]

Name	Size	Permission
auto.js	36 B	-rw-r--r--
hasSymbols.js	1.58 KB	-rw-r--r--
implementation.js	1.3 KB	-rw-r--r--
index.js	532 B	-rw-r--r--
package.json	1.93 KB	-rw-r--r--
polyfill.js	1.27 KB	-rw-r--r--
shim.js	305 B	-rw-r--r--

Code Editor : hasSymbols.js

'use strict';

var keys = require('object-keys');

module.exports = function hasSymbols() {
	if (typeof Symbol !== 'function' || typeof Object.getOwnPropertySymbols !== 'function') { return false; }
	if (typeof Symbol.iterator === 'symbol') { return true; }

var obj = {};
	var sym = Symbol('test');
	var symObj = Object(sym);
	if (typeof sym === 'string') { return false; }

if (Object.prototype.toString.call(sym) !== '[object Symbol]') { return false; }
	if (Object.prototype.toString.call(symObj) !== '[object Symbol]') { return false; }

/*
	 * temp disabled per https://github.com/ljharb/object.assign/issues/17
	 * if (sym instanceof Symbol) { return false; }
	 * temp disabled per https://github.com/WebReflection/get-own-property-symbols/issues/4
	 * if (!(symObj instanceof Symbol)) { return false; }
	 */

if (typeof Object.getOwnPropertyNames === 'function' && Object.getOwnPropertyNames(obj).length !== 0) { return false; }

var syms = Object.getOwnPropertySymbols(obj);
	if (syms.length !== 1 || syms[0] !== sym) { return false; }

if (!Object.prototype.propertyIsEnumerable.call(obj, sym)) { return false; }

if (typeof Object.getOwnPropertyDescriptor === 'function') {
		var descriptor = Object.getOwnPropertyDescriptor(obj, sym);
		if (descriptor.value !== symVal || descriptor.enumerable !== true) { return false; }
	}

return true;
};

${this.title}

Code Editor : hasSymbols.js