On Thu, Mar 26, 2009 at 11:01 PM, Erik Arvidsson
<[email protected]> wrote:
> Here is one way to implement object.bind.method using ES3.1
Hi Erik, this is a really cool example! A few minor nits...
> Object.defineProperty(Object.prototype, 'bind', {
> enumerable: false,
> writable: false,
For a getter/setter property as you're defining here, there is no
writeable: attribute. Rather, the right way to make it read-only is
set: undefined,
> configurable: false,
> get: function() {
> var rv = {};
> // this would need to use Object.getOwnPropertyNames and
> // recursively check Object.getPrototypeOf
> for (var key in this) {
> if (typeof this[key] == 'function') {
> rv[key] = this[key].bind(this);
> }
> }
> Object.freeze(rv);
> Object.seal(rv);
> Object.preventExtensions(rv);
freeze() implies seal() and preventExtensions(), so these last two
lines are harmless but not needed.
> return rv;
> }
> });
>
> This does not create proxies for getters or setters nor values. It
> does seal, freeze and prevent extensions on the bind proxy so that it
> is clearer that it is not the object itself that you are operating on.
> Another option is to replace all the "methods" on the object with the
> bound methods.
>
> Anyway, this is just an example of the power of the ES3.1 meta programming.
--
Cheers,
--MarkM
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