main
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Last change
on this file was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago |
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Update repo after prototype presentation
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Property mode
set to
100644
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File size:
621 bytes
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| [d565449] | 1 | 'use strict';
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| 2 |
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| 3 | var GetIntrinsic = require('get-intrinsic');
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| 4 |
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| 5 | var $isConcatSpreadable = GetIntrinsic('%Symbol.isConcatSpreadable%', true);
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| 6 |
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| 7 | var Get = require('./Get');
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| 8 | var IsArray = require('./IsArray');
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| 9 | var ToBoolean = require('./ToBoolean');
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| 10 | var Type = require('./Type');
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| 11 |
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| 12 | // https://262.ecma-international.org/6.0/#sec-isconcatspreadable
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| 13 |
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| 14 | module.exports = function IsConcatSpreadable(O) {
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| 15 | if (Type(O) !== 'Object') {
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| 16 | return false;
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| 17 | }
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| 18 | if ($isConcatSpreadable) {
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| 19 | var spreadable = Get(O, $isConcatSpreadable);
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| 20 | if (typeof spreadable !== 'undefined') {
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| 21 | return ToBoolean(spreadable);
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| 22 | }
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| 23 | }
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| 24 | return IsArray(O);
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| 25 | };
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