WhatIsClosure

Closure

• This is a notion out of the Lisp world that says if you define an anonymous function in a particular lexical context, it pretends to run in that context even when it's called outside of the context.

• they're one of those aspects of Perl -- like object-oriented programming -- that everyone raves about and you can't really see the big deal until you play around with them and then they just click.

References

• Perl FAQ 3.14 - What's a "closure"?

• Advanced Perl Programming 4.3 Closures

• Achieving Closure

Closures in Java

• Closures for the Java Programming Language (aka BGGA)

• Neal Gafter's Presentation on Closure for Java Proposal