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Last change
on this file since 8d391a1 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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| 1 | var fails = require('../internals/fails');
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| 2 | var wellKnownSymbol = require('../internals/well-known-symbol');
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| 3 | var V8_VERSION = require('../internals/engine-v8-version');
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| 4 |
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| 5 | var SPECIES = wellKnownSymbol('species');
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| 6 |
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| 7 | module.exports = function (METHOD_NAME) {
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| 8 | // We can't use this feature detection in V8 since it causes
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| 9 | // deoptimization and serious performance degradation
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| 10 | // https://github.com/zloirock/core-js/issues/677
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| 11 | return V8_VERSION >= 51 || !fails(function () {
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| 12 | var array = [];
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| 13 | var constructor = array.constructor = {};
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| 14 | constructor[SPECIES] = function () {
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| 15 | return { foo: 1 };
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| 16 | };
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| 17 | return array[METHOD_NAME](Boolean).foo !== 1;
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| 18 | });
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| 19 | };
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