Add object rest destructuring test

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Alexey Shvayka 2020-04-23 18:04:27 +03:00 committed by Rick Waldron
parent b08380c723
commit 39ed5d9d68
1 changed files with 45 additions and 0 deletions

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// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-destructuring-binding-patterns-runtime-semantics-restbindinginitialization
description: >
Proxy keys are iterated in order they were provided by "ownKeys" trap.
info: |
BindingRestProperty : ... BindingIdentifier
[...]
3. Perform ? CopyDataProperties(restObj, value, excludedNames).
CopyDataProperties ( target, source, excludedItems )
[...]
5. Let keys be ? from.[[OwnPropertyKeys]]().
6. For each element nextKey of keys in List order, do
[...]
c. If excluded is false, then
i. Let desc be ? from.[[GetOwnProperty]](nextKey).
[[OwnPropertyKeys]] ( )
[...]
7. Let trapResultArray be ? Call(trap, handler, « target »).
8. Let trapResult be ? CreateListFromArrayLike(trapResultArray, « String, Symbol »).
[...]
23. Return trapResult.
features: [object-rest, destructuring-binding, Proxy, Symbol]
includes: [compareArray.js]
---*/
var getOwnKeys = [];
var ownKeysResult = [Symbol(), "foo", "0"];
var proxy = new Proxy({}, {
getOwnPropertyDescriptor: function(_target, key) {
getOwnKeys.push(key);
},
ownKeys: function() {
return ownKeysResult;
},
});
let {...$} = proxy;
assert.compareArray(getOwnKeys, ownKeysResult);