I certainly agree, but it has been decided otherwhise by the TC39 members and I
doubt they’re willing to revert their decision.
De : Andrea Giammarchi
Envoyé : 18 mars 2013 17:08
À : Nathan Wall
Cc : es-discuss@mozilla.org
Objet : Re: Mutable Proto
I would like to see Object.setPrototypeOf(object, proto) too and a disappeared
__proto__ 'till now breaking too much.
It would be much easier to implement all shenanigans via
Object.defineProperty(Object.prototype, '__proto__', {whatever}); rather than
fix current non-standard __proto__ ...
+1
On Mon, Mar 18, 2013 at 9:04 AM, Nathan Wall <nathan.w...@live.com> wrote:
A previous thread [1] brought to my attention the fact that objects which don't
inherit from Object.prototype won't have mutable __proto__. This was something
I had missed and breaks some scripts I'm currently using because I have objects
which I don't want to inherit from Object.prototype but for which I do want to
have mutable proto.
Testing in Firefox Nightly I found this workaround:
var x = { }, y = { foo: 'bar' };
x.__proto__ = y;
console.log(1, x.foo);
// => 1 'bar'
x.__proto__ = null;
console.log(2, x.foo);
// => 2 undefined
x.__proto__ = y;
console.log(3, x.foo);
// => 3 undefined
var _setPrototype = Object.getOwnPropertyDescriptor(Object.prototype,
'__proto__').set,
setPrototypeOf = Function.prototype.call.bind(_setPrototype);
setPrototypeOf(x, y);
console.log(4, x.foo);
// => 4 'bar'
Is this workaround a temporary bug in Firefox's current implementation? Or will
this be the spec'ed behavior for ES6? Can we use such a method to mutate
prototype on objects which don't inherit from Object.prototype?
[1] https://mail.mozilla.org/pipermail/es-discuss/2013-March/029176.html
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