Skip to content

Instantly share code, notes, and snippets.

What would you like to do?
A plural ES5 + ES6 friendly version of Object.getOwnPropertyDescriptor
'getOwnPropertyDescriptors' in Object || (
Object.getOwnPropertyDescriptors = function (Object) {
gOPD = Object.getOwnPropertyDescriptor,
gOPN = Object.getOwnPropertyNames,
gOPS = Object.getOwnPropertySymbols,
gNS = gOPS ? function (object) {
return gOPN(object).concat(gOPS(object));
} :
function copyFrom(key) {
descriptors[key] = gOPD(this, key);
return function getOwnPropertyDescriptors(object) {
var result = descriptors = {};
gNS(object).forEach(copyFrom, object);
descriptors = null;
return result;

This comment has been minimized.

Copy link
Owner Author

commented Mar 3, 2014

the aim of this proposal is to make possible to create a shallow copy of a generic JS object in this way

var shallowCopy = Object.create(

another pattern solved by this proposal is the following:


which is useful to simulate Object.mixin which didn't make it in ES6, together with previously mentioned Object.clone or copy as shallow.


This comment has been minimized.

Copy link
Owner Author

commented Mar 4, 2014

this has been written also as ES6 specification

Looking forward for the next TC39 meeting in April


This comment has been minimized.

Copy link

commented Jan 30, 2015

An alternate polyfillable ES6 version that relies on Reflect.ownKeys, Array#reduce, and Object.getOwnPropertyDescriptor:

function getOwnPropertyDescriptors(obj) {
  return Reflect.ownKeys(obj).reduce(function (acc, key) {
    acc[key] = Object.getOwnPropertyDescriptor(obj, key);
    return acc;
  }, {});

(just posting this comment here so I don't forget it later ;-) )


This comment has been minimized.

Copy link
Owner Author

commented Jun 18, 2015

A possible Object.copy that works like Object.assign but includes getters, setters, and non enumerable properties too.

Object.copy = (function (O) {
    dP    = O.defineProperty,
    gOPD  = O.getOwnPropertyDescriptor,
    gOPN  = O.getOwnPropertyNames,
    gOPS  = O.getOwnPropertySymbols,
    set   = function (target, source) {
      for (var
        keys = gOPN(source).concat(gOPS(source)),
        i = 0,
        l = keys.length; i < l; i++
      ) {
        key = keys[i];
        dP(target, key, gOPD(source, key));
  return function copy(target) {
    for (var i = 1, l = arguments.length; i < l; i++) {
      set(target, arguments[i]);
    return target;
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.