order-after-define-property.js

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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-object.getownpropertydescriptors

description: >

  Property names are returned in ascending chronological order of creation

  that is unaffected by [[DefineOwnProperty]].

info: |

  Object.getOwnPropertyDescriptors ( O )

  [...]

  2. Let ownKeys be ? obj.[[OwnPropertyKeys]]().

  3. Let descriptors be ! OrdinaryObjectCreate(%Object.prototype%).

  4. For each element key of ownKeys in List order, do

    [...]

    c. If descriptor is not undefined,

    perform ! CreateDataPropertyOrThrow(descriptors, key, descriptor).

  5. Return descriptors.

  OrdinaryOwnPropertyKeys ( O )

  [...]

  3. For each own property key P of O that is a String but is not an array index,

  in ascending chronological order of property creation, do

    a. Add P as the last element of keys.

  4. For each own property key P of O that is a Symbol, in ascending

  chronological order of property creation, do

    a. Add P as the last element of keys.

  5. Return keys.

features: [Symbol, Reflect]

includes: [compareArray.js]

---*/

var obj = {};

var symA = Symbol("a");

var symB = Symbol("b");

obj[symA] = 1;

obj[symB] = 2;

Object.defineProperty(obj, symA, {configurable: false});

var objDescs = Object.getOwnPropertyDescriptors(obj);

assert.compareArray(Reflect.ownKeys(objDescs), [symA, symB]);

var re = /(?:)/g;

re.a = 1;

Object.defineProperty(re, "lastIndex", {value: 2});

var reDescs = Object.getOwnPropertyDescriptors(re);

assert.compareArray(Reflect.ownKeys(reDescs), ["lastIndex", "a"]);

reportCompare(0, 0);