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23 lines
902 B
23 lines
902 B
2 years ago
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var $ = require('../internals/export');
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var getBuiltIn = require('../internals/get-built-in');
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var hasOwn = require('../internals/has-own-property');
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var toString = require('../internals/to-string');
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var shared = require('../internals/shared');
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var NATIVE_SYMBOL_REGISTRY = require('../internals/native-symbol-registry');
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var StringToSymbolRegistry = shared('string-to-symbol-registry');
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var SymbolToStringRegistry = shared('symbol-to-string-registry');
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// `Symbol.for` method
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// https://tc39.es/ecma262/#sec-symbol.for
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$({ target: 'Symbol', stat: true, forced: !NATIVE_SYMBOL_REGISTRY }, {
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'for': function (key) {
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var string = toString(key);
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if (hasOwn(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];
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var symbol = getBuiltIn('Symbol')(string);
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StringToSymbolRegistry[string] = symbol;
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SymbolToStringRegistry[symbol] = string;
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return symbol;
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}
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});
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