map-instance.js (551B)
1 // Copyright (c) 2023 Ecma International. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 esid: sec-map.groupby 6 description: Map.groupBy returns a Map instance 7 info: | 8 Map.groupBy ( items, callbackfn ) 9 10 ... 11 12 2. Let map be ! Construct(%Map%). 13 ... 14 4. Return map. 15 16 ... 17 features: [array-grouping, Map] 18 ---*/ 19 20 const array = [1, 2, 3]; 21 22 const map = Map.groupBy(array, function (i) { 23 return i % 2 === 0 ? 'even' : 'odd'; 24 }); 25 26 assert.sameValue(map instanceof Map, true); 27 28 reportCompare(0, 0);