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.getownpropertysymbols

description: >

  Property names are returned in ascending chronological order of creation

  that is unaffected by [[DefineOwnProperty]].

info: |

  Object.getOwnPropertySymbols ( O )

  1. Return ? GetOwnPropertyKeys(O, Symbol).

  GetOwnPropertyKeys ( O, type )

  1. Let obj be ? ToObject(O).

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

  [...]

  OrdinaryOwnPropertyKeys ( O )

  [...]

  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]

includes: [compareArray.js]

---*/

var symA = Symbol("a");

var symB = Symbol("b");

var obj = {};

obj[symA] = 1;

obj[symB] = 2;

Object.defineProperty(obj, symA, {

  get: function() {},

});

assert.compareArray(Object.getOwnPropertySymbols(obj), [symA, symB]);

var arr = [];

arr[symA] = 1;

arr[symB] = 2;

Object.defineProperty(arr, symA, {writable: false});

assert.compareArray(Object.getOwnPropertySymbols(arr), [symA, symB]);

reportCompare(0, 0);