well-known-symbol.js
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well-known-symbol.js
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	var global = require('../internals/global');
	var shared = require('../internals/shared');
	var hasOwn = require('../internals/has-own-property');
	var uid = require('../internals/uid');
	var NATIVE_SYMBOL = require('../internals/symbol-constructor-detection');
	var USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');

	var WellKnownSymbolsStore = shared('wks');
	var Symbol = global.Symbol;
	var symbolFor = Symbol && Symbol['for'];
	var createWellKnownSymbol = USE_SYMBOL_AS_UID ? Symbol : Symbol && Symbol.withoutSetter \|\| uid;

	module.exports = function (name) {
	if (!hasOwn(WellKnownSymbolsStore, name) \|\| !(NATIVE_SYMBOL \|\| typeof WellKnownSymbolsStore[name] == 'string')) {
	var description = 'Symbol.' + name;
	if (NATIVE_SYMBOL && hasOwn(Symbol, name)) {
	WellKnownSymbolsStore[name] = Symbol[name];
	} else if (USE_SYMBOL_AS_UID && symbolFor) {
	WellKnownSymbolsStore[name] = symbolFor(description);
	} else {
	WellKnownSymbolsStore[name] = createWellKnownSymbol(description);
	}
	} return WellKnownSymbolsStore[name];
	};