GT2/GT2-iOS/node_modules/is-symbol/index.js

28 lines
773 B
JavaScript

'use strict';
var toStr = Object.prototype.toString;
var hasSymbols = typeof Symbol === 'function' && typeof Symbol() === 'symbol';
if (hasSymbols) {
var symToStr = Symbol.prototype.toString;
var symStringRegex = /^Symbol\(.*\)$/;
var isSymbolObject = function isSymbolObject(value) {
if (typeof value.valueOf() !== 'symbol') { return false; }
return symStringRegex.test(symToStr.call(value));
};
module.exports = function isSymbol(value) {
if (typeof value === 'symbol') { return true; }
if (toStr.call(value) !== '[object Symbol]') { return false; }
try {
return isSymbolObject(value);
} catch (e) {
return false;
}
};
} else {
module.exports = function isSymbol(value) {
// this environment does not support Symbols.
return false;
};
}