From 46e43f4bde4a35785b4997b81e86cd19f046b69b Mon Sep 17 00:00:00 2001 From: Minteck Date: Tue, 21 Dec 2021 16:52:28 +0100 Subject: Commit --- .../es-abstract/2017/IsConcatSpreadable.js | 25 ++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 src/node_modules/es-abstract/2017/IsConcatSpreadable.js (limited to 'src/node_modules/es-abstract/2017/IsConcatSpreadable.js') diff --git a/src/node_modules/es-abstract/2017/IsConcatSpreadable.js b/src/node_modules/es-abstract/2017/IsConcatSpreadable.js new file mode 100644 index 0000000..dc8aae1 --- /dev/null +++ b/src/node_modules/es-abstract/2017/IsConcatSpreadable.js @@ -0,0 +1,25 @@ +'use strict'; + +var GetIntrinsic = require('../GetIntrinsic'); + +var $isConcatSpreadable = GetIntrinsic('%Symbol.isConcatSpreadable%', true); + +var Get = require('./Get'); +var IsArray = require('./IsArray'); +var ToBoolean = require('./ToBoolean'); +var Type = require('./Type'); + +// https://ecma-international.org/ecma-262/6.0/#sec-isconcatspreadable + +module.exports = function IsConcatSpreadable(O) { + if (Type(O) !== 'Object') { + return false; + } + if ($isConcatSpreadable) { + var spreadable = Get(O, $isConcatSpreadable); + if (typeof spreadable !== 'undefined') { + return ToBoolean(spreadable); + } + } + return IsArray(O); +}; -- cgit