string.js (668B)
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 works for string items 7 info: | 8 Map.groupBy ( items, callbackfn ) 9 ... 10 includes: [compareArray.js] 11 features: [array-grouping, Map] 12 ---*/ 13 14 const string = '🥰💩🙏😈'; 15 16 const map = Map.groupBy(string, function (char) { 17 return char < '🙏' ? 'before' : 'after'; 18 }); 19 20 assert.compareArray(Array.from(map.keys()), ['after', 'before']); 21 assert.compareArray(map.get('before'), ['💩', '😈']); 22 assert.compareArray(map.get('after'), ['🥰', '🙏']); 23 24 reportCompare(0, 0);