Confusing Javascript class declaration

Posted by clutch on Stack Overflow See other posts from Stack Overflow or by clutch
Published on 2010-04-01T19:07:40Z Indexed on 2010/04/01 19:13 UTC
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JavaScript

I have some third-party Javascript that has statements like this:

FOO = function() {
   ...functions() ... 
   return { hash }
}();

It is working as designed but I'm confused by it. Can anybody define what this structure is doing? Is it just a weird way to create a class?

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Confusing Javascript class declaration - Developer IT

Confusing Javascript class declaration

JavaScript

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