| Leo Repp | 58b9f11 | 2021-11-22 11:57:47 +0100 | [diff] [blame^] | 1 | 'use strict'; |
| 2 | |
| 3 | var GetIntrinsic = require('get-intrinsic'); |
| 4 | |
| 5 | var $isConcatSpreadable = GetIntrinsic('%Symbol.isConcatSpreadable%', true); |
| 6 | |
| 7 | var Get = require('./Get'); |
| 8 | var IsArray = require('./IsArray'); |
| 9 | var ToBoolean = require('./ToBoolean'); |
| 10 | var Type = require('./Type'); |
| 11 | |
| 12 | // https://ecma-international.org/ecma-262/6.0/#sec-isconcatspreadable |
| 13 | |
| 14 | module.exports = function IsConcatSpreadable(O) { |
| 15 | if (Type(O) !== 'Object') { |
| 16 | return false; |
| 17 | } |
| 18 | if ($isConcatSpreadable) { |
| 19 | var spreadable = Get(O, $isConcatSpreadable); |
| 20 | if (typeof spreadable !== 'undefined') { |
| 21 | return ToBoolean(spreadable); |
| 22 | } |
| 23 | } |
| 24 | return IsArray(O); |
| 25 | }; |