I hate javascript's "$bind"

[我每天睡不着]

js.Browser.document.onclick = function(e:js.html.KeyboardEvent){

    if (e.stopPropagation != null) e.stopPropagation();   // for ie

}

output:

window.document.onclick = function(e) {

    if($bind(e,e.stopPropagation) != null) {

        e.stopPropagation();

    }

};

for extern class, why not remove the "$bind" to get the cleaner output???

and for js-es5, why not just using `Function.prototype.bind` instead "$bind" ???

[Juraj Kirchheim]

On Mon, May 2, 2016 at 6:52 AM, 我每天睡不着 <sen...@gmail.com> wrote:

for extern class, why not remove the "$bind" to get the cleaner output???

1. An extern class needn't be native. It could also be a haxe generated class from a different haxe/js file.

2. Simply because `this` gets lost and generally that's undesired.

and for js-es5, why not just using `Function.prototype.bind` instead "$bind" ???

Because if `e.stopPropagation` is `null` then `e.stopPropagation.bind(e)` will give you a null pointer exception.

It can be argued that when checking for the existence of a function, the `$bind` is superfluous and should not be generated at all. You can try raising an issue on GitHub. Personally, I think you'll be better off just ignoring this detail ;)

Best,

Juraj

[Philippe Elsass]

There's also an important feature of $bind: it always return the same reference (for the same function and scope), which allows you to addListener/removeListener without saving the result of the binding, which would be very confusing as you never write the binding code yourself.

However you're right that in your example the $bind is superfluous.

Philippe

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