FWIW, I tried very hard to come up with an example but failed. If I understand
it correctly fat arrow acts is a helper for `var self = this`. Then it no
matter what the underlying method does the following code will simply ignore
`this`:
var self = this;
DOM.each("div", function (el) {
self.doSomething();
});
Rewriting it using the new syntax:
DOM.each("div", (el) => {
this.doSomething();
});
Correct me if I misunderstand how => works.
Anton
On Thursday, May 31, 2012 at 7:42 PM, David Herman wrote:
> On May 31, 2012, at 6:06 PM, Rick Waldron wrote:
>
> > The original API allowed me to pass an explicitly bound callback (whether
> > it was by bind or fat arrow) and have that binding take precendence over a
> > default behavior.
>
> I think you might still be missing a key point: if `callbackFn` is a bound
> function, there's no important difference in behavior between
>
> callbackFn.call(elems, x, i)
>
> and
>
> callbackFn(x, i)
>
> The former passes elems as a `this` parameter, but `callbackFn` ignores it
> and uses its own bound `this`. The latter doesn't pass a `this` parameter,
> and `callbackFn` uses its own bound `this`. Either way, you get the same
> behavior. So you can simply replace lines 9 - 22 with
>
> [].forEach.call( elems, callbackFn );
>
> And there's no need for the isBound predicate.
>
> Dave
>
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