source: imaps-frontend/node_modules/es-abstract/2017/IsConcatSpreadable.js@ 79a0317

'use strict';

var GetIntrinsic = require('get-intrinsic');

var $isConcatSpreadable = GetIntrinsic('%Symbol.isConcatSpreadable%', true);

var Get = require('./Get');
var IsArray = require('./IsArray');
var ToBoolean = require('./ToBoolean');

var isObject = require('../helpers/isObject');

// https://262.ecma-international.org/6.0/#sec-isconcatspreadable

module.exports = function IsConcatSpreadable(O) {
        if (!isObject(O)) {
                return false;
        }
        if ($isConcatSpreadable) {
                var spreadable = Get(O, $isConcatSpreadable);
                if (typeof spreadable !== 'undefined') {
                        return ToBoolean(spreadable);
                }
        }
        return IsArray(O);
};