| 1 | 'use strict';
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| 2 | var getBuiltIn = require('../internals/get-built-in');
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| 3 | var isCallable = require('../internals/is-callable');
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| 4 | var isPrototypeOf = require('../internals/object-is-prototype-of');
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| 5 | var USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');
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| 6 |
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| 7 | var $Object = Object;
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| 8 |
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| 9 | module.exports = USE_SYMBOL_AS_UID ? function (it) {
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| 10 | return typeof it == 'symbol';
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| 11 | } : function (it) {
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| 12 | var $Symbol = getBuiltIn('Symbol');
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| 13 | return isCallable($Symbol) && isPrototypeOf($Symbol.prototype, $Object(it));
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| 14 | };
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