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42 lines
1.2 KiB
JavaScript
42 lines
1.2 KiB
JavaScript
// Copyright (C) 2020 Alexey Shvayka. 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-object.assign
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description: >
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Proxy keys are iterated in order they were provided by "ownKeys" trap.
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info: |
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Object.assign ( target, ...sources )
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[...]
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4. For each element nextSource of sources, in ascending index order, do
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a. If nextSource is neither undefined nor null, then
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[...]
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ii. Let keys be ? from.[[OwnPropertyKeys]]().
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iii. For each element nextKey of keys in List order, do
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1. Let desc be ? from.[[GetOwnProperty]](nextKey).
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[[OwnPropertyKeys]] ( )
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[...]
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7. Let trapResultArray be ? Call(trap, handler, « target »).
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8. Let trapResult be ? CreateListFromArrayLike(trapResultArray, « String, Symbol »).
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[...]
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23. Return trapResult.
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features: [Proxy, Symbol]
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includes: [compareArray.js]
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---*/
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var getOwnKeys = [];
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var ownKeysResult = [Symbol(), "foo", "0"];
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var proxy = new Proxy({}, {
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getOwnPropertyDescriptor: function(_target, key) {
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getOwnKeys.push(key);
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},
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ownKeys: function() {
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return ownKeysResult;
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},
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});
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Object.assign({}, proxy);
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assert.compareArray(getOwnKeys, ownKeysResult);
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