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Comments on Closure

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May 09.2011

Hi,

Thanks to everyone for answering all my dumb questions about scope, and for helping me to overcome my Java mentality. I’ve been thinking a fair bit about scope and closure, and I wanted to write something that explained it succinctly and to my satisfaction, without any spooky stuff, so I wrote this:

[URL=”http://webofawesome.com/post/what-is-it-with-closure/”]webofawesome.com/post/what-is-it-with-closure/[/URL]

I’d really appreciate any thoughts or feedback…

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JavaScript

3 Comments(s) ↴

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@goldfidgetauthorMay 09.2011 — The idea is that the scope object is created when a function is [B]run[/B]. The scope chain pointer is instantiated when a function is [B]created[/B], and is then immutable. When accessing a local variable the interpreter first looks in the scope object, then in the scope chain, then in the global scope.

This gives us closure...
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@rnd_meMay 09.2011 — you are on the right track, but not 100% correct.

consider that unclosed local variables disappear. This implies that there is no fixed/local scope object that is inherited by "sub functions". otherwise, a lot of garbage would pile up. in short, only the reachable variables are closed, not all locals on the same object.

the spec makes it clear: "activation object"s perform the closure dirty-work.

read the spec for details.
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@kiddomanMay 10.2011 — Thanks for sharing your information!
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