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Last change
on this file since 188ee53 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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| 1 | var wellKnownSymbol = require('../internals/well-known-symbol');
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| 2 | var create = require('../internals/object-create');
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| 3 | var definePropertyModule = require('../internals/object-define-property');
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| 4 |
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| 5 | var UNSCOPABLES = wellKnownSymbol('unscopables');
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| 6 | var ArrayPrototype = Array.prototype;
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| 7 |
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| 8 | // Array.prototype[@@unscopables]
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| 9 | // https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
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| 10 | if (ArrayPrototype[UNSCOPABLES] == undefined) {
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| 11 | definePropertyModule.f(ArrayPrototype, UNSCOPABLES, {
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| 12 | configurable: true,
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| 13 | value: create(null)
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| 14 | });
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| 15 | }
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| 16 |
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| 17 | // add a key to Array.prototype[@@unscopables]
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| 18 | module.exports = function (key) {
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| 19 | ArrayPrototype[UNSCOPABLES][key] = true;
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| 20 | };
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