1065734 - util/object.extend behaves unexpectedly.

Status: RESOLVED INVALID

(Add-on SDK Graveyard :: Documentation, defect)

Description

[Gregg Lind (Fx Strategy and Insights - Shield - Heartbeat )]

https://developer.mozilla.org/en-US/Add-ons/SDK/Low-Level_APIs/util_object

I expected this to work:
```
exports['test extend'] = function(assert) {
  let a = {a: 1};
  let b = {b: 2};
  let c = extend(a, b);
  assert.deepEqual(Object.keys(c).sort(), ['a', 'b'], 'cool' );
  let a = extend(a,b);
  assert.deepEqual(Object.keys(a).sort(), ['a', 'b'], 'cool' );
};
```

Perhaps a doc clarification that the keys are the UNION OF ALL KEYS *but not* those of the first object?

Comment 1

[Irakli Gozalishvili [:irakli] [:gozala] [@gozala]]

Greg I do believe that is what the documentation says:

> Returns an object that inherits from the first argument and contains all of the properties from all following arguments, with precedence from right to left.

If you think you can think of way of making it more clear feel free to modify modify wiki page, that's why we moved docs to mdn ;)