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58 lines
1.7 KiB
JavaScript
58 lines
1.7 KiB
JavaScript
// Copyright (C) 2021 Alexey Shvayka. All rights reserved.
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// This code is governed by the 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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[[Set]] to existing data property of non-extensible `target` is successful.
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info: |
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OrdinaryPreventExtensions ( O )
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1. Set O.[[Extensible]] to false.
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Object.assign ( target, ...sources )
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[...]
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3. For each element nextSource of sources, do
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a. If nextSource is neither undefined nor null, then
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[...]
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iii. For each element nextKey of keys, do
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1. Let desc be ? from.[[GetOwnProperty]](nextKey).
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2. If desc is not undefined and desc.[[Enumerable]] is true, then
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[...]
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b. Perform ? Set(to, nextKey, propValue, true).
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OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc )
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[...]
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3. If IsDataDescriptor(ownDesc) is true, then
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[...]
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c. Let existingDescriptor be ? Receiver.[[GetOwnProperty]](P).
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d. If existingDescriptor is not undefined, then
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[...]
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iii. Let valueDesc be the PropertyDescriptor { [[Value]]: V }.
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iv. Return ? Receiver.[[DefineOwnProperty]](P, valueDesc).
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ValidateAndApplyPropertyDescriptor ( O, P, extensible, Desc, current )
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[...]
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9. If O is not undefined, then
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a. For each field of Desc that is present, set the corresponding attribute
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of the property named P of object O to the value of the field.
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10. Return true.
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features: [Symbol]
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---*/
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var target1 = Object.preventExtensions({ foo: 1 });
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Object.assign(target1, { foo: 2 });
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assert.sameValue(target1.foo, 2);
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var sym = Symbol();
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var target2 = { [sym]: 1 };
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Object.preventExtensions(target2);
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Object.assign(target2, { [sym]: 2 });
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assert.sameValue(target2[sym], 2);
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