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33 lines
777 B
JavaScript
33 lines
777 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 calls function with correct arguments
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info: |
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Map.groupBy ( items, callbackfn )
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...
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GroupBy ( items, callbackfn, coercion )
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6. Repeat,
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e. Let key be Completion(Call(callbackfn, undefined, « value, 𝔽(k) »)).
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...
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features: [array-grouping, Map]
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---*/
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const arr = [-0, 0, 1, 2, 3];
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let calls = 0;
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Map.groupBy(arr, function (n, i) {
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calls++;
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assert.sameValue(n, arr[i], "selected element aligns with index");
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assert.sameValue(arguments.length, 2, "only two arguments are passed");
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return null;
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});
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assert.sameValue(calls, 5, 'called for all 5 elements');
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