tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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creates-a-data-descriptor.js (2692B)

      1 // Copyright (C) 2015 the V8 project authors. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 es6id: 26.1.13
      5 description: >
      6  Creates a property data descriptor.
      7 info: |
      8  26.1.13 Reflect.set ( target, propertyKey, V [ , receiver ] )
      9 
     10  ...
     11  4. If receiver is not present, then
     12    a. Let receiver be target.
     13  5. Return target.[[Set]](key, V, receiver).
     14 
     15  9.1.9 [[Set]] ( P, V, Receiver)
     16 
     17  ...
     18  4. If ownDesc is undefined, then
     19    a. Let parent be O.[[GetPrototypeOf]]().
     20    b. ReturnIfAbrupt(parent).
     21    c. If parent is not null, then
     22      i. Return parent.[[Set]](P, V, Receiver).
     23    d. Else,
     24      ii. Let ownDesc be the PropertyDescriptor{[[Value]]: undefined,
     25      [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}.
     26  5. If IsDataDescriptor(ownDesc) is true, then
     27    a. If ownDesc.[[Writable]] is false, return false.
     28    b. If Type(Receiver) is not Object, return false.
     29    c. Let existingDescriptor be Receiver.[[GetOwnProperty]](P).
     30    d. ReturnIfAbrupt(existingDescriptor).
     31    e. If existingDescriptor is not undefined, then
     32      i. If IsAccessorDescriptor(existingDescriptor) is true, return false.
     33      ii. If existingDescriptor.[[Writable]] is false, return false.
     34      iii. Let valueDesc be the PropertyDescriptor{[[Value]]: V}.
     35      iv. Return Receiver.[[DefineOwnProperty]](P, valueDesc).
     36    f. Else Receiver does not currently have a property P,
     37      i. Return CreateDataProperty(Receiver, P, V).
     38  6. Assert: IsAccessorDescriptor(ownDesc) is true.
     39  7. Let setter be ownDesc.[[Set]].
     40  8. If setter is undefined, return false.
     41  ...
     42  11. Return true.
     43 includes: [propertyHelper.js]
     44 features: [Reflect, Reflect.set]
     45 ---*/
     46 
     47 var o1 = {};
     48 var result = Reflect.set(o1, 'p', 42);
     49 assert.sameValue(result, true, 'returns true on a successful setting');
     50 var desc = Object.getOwnPropertyDescriptor(o1, 'p');
     51 assert.sameValue(
     52  desc.value, 42,
     53  'sets a data descriptor to set a new property'
     54 );
     55 verifyProperty(o1, 'p', {
     56  writable: true,
     57  enumerable: true,
     58  configurable: true,
     59 });
     60 
     61 var o2 = {};
     62 var receiver = {};
     63 result = Reflect.set(o2, 'p', 43, receiver);
     64 assert.sameValue(
     65  result, true,
     66  'returns true on a successful setting with a receiver'
     67 );
     68 desc = Object.getOwnPropertyDescriptor(o2, 'p');
     69 assert.sameValue(
     70  desc, undefined,
     71  'does not set a data descriptor on target if receiver is given'
     72 );
     73 desc = Object.getOwnPropertyDescriptor(receiver, 'p');
     74 assert.sameValue(
     75  desc.value, 43,
     76  'sets a data descriptor on the receiver object to set a new property'
     77 );
     78 verifyProperty(receiver, 'p', {
     79  writable: true,
     80  enumerable: true,
     81  configurable: true,
     82 });
     83 
     84 reportCompare(0, 0);