var self = this; on Dion Almaer's Blog

Apr 12

var self = this;

$.fn.delayHide(time, callbackArgument) {
var self = this;
setTimeout(function() {
callbackArgument.call(self);
}, time);
}

I find that I have to use the var self = this; pattern far too often in JavaScript.

The darn magic scoping of this really gets ya.

I also had someone ask me why foo never ended up containing something:

var foo = bar(function() {
....
return something;
});

It made me more worried about adding closures to Java :)

Stephen Colebourne Says:
April 13th, 2007 at 7:16 am
Not all closures proposals are equal. In this example:

public void process() {
foo = bar( { =>
….
return something;
});
}

The return will return from process() in BGGA closures as you hint at, and foo will not be set.

But in FCM closures – http://docs.google.com/Doc?id=ddhp95vd_0f7mcns – the return will return back to the invoker of the closure, as with inner classes, and foo will be set.

Which semantic do you prefer?
carmen Says:
April 15th, 2007 at 1:46 pm
crockford calls it a ‘design error’ i think. i mean technically an inner anonymous function _is_ a new object, so it should get a new ‘this’, no? id definitely like it to inherit via lexical scoping as well, but what can you do.

are they fixing this bug in 2.0?
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May 19th, 2008 at 12:00 am
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