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Martin Fowler has a good introduction to closur= es on his bliki.
There are two syntaxes for closures: a block based syntax with syntactic= ally significant whitespace and a braces based that ignores whitespace.
Boo closures have have full access (to read and write) to their enclosin= g lexical environment. For Instance:
The best source of information right now are the test cases for closures= in the tests/testcases/integr= ation directory.
Some things you can do with named functions that you cannot with closure= s include recursion and overloading:
This will not work because "c" is unknown from inside the clos= ure:
so you can use a regular named function or else create a 2nd callable to= hold the name:
And you can use regular named functions to overload a method: