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23 lines
619 B
JavaScript
23 lines
619 B
JavaScript
// Copyright (c) 2023 Ecma International. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-map.groupby
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description: Map.groupBy works for string items
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info: |
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Map.groupBy ( items, callbackfn )
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...
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includes: [compareArray.js]
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features: [array-grouping, Map]
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---*/
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const string = 'abcd';
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const map = Map.groupBy(string, function (char) {
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return char < 'c' ? 'before' : 'after';
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});
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assert.compareArray(Array.from(map.keys()), ['before', 'after']);
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assert.compareArray(map.get('before'), ['a', 'b']);
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assert.compareArray(map.get('after'), ['c', 'd']);
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