teaching programming to kids - Re: Looking for 8080/Z80 BASIC

On Jan 5, 2012, at 12:09 PM, Liam Proven wrote: I can take that one, though I fully expect someone to correct me if I get something wrong. ?Closures are a way of encapsulating data in a particular function instance, not unlike the member data associated with an object's method. ?For example, in Python I could write the following function: # foo is expected to be a list here def function_generator(foo): ? ?def _f(x): ? ? ? ?foo.append(x) ? ?return _f And I would generate a callable function that would append x to the list foo. ?For example: bar = [] append_func = function_generator(bar) append_func("abc") print bar Would print "['abc']". It's a toy example, for sure, but they're great for things like callbacks (it's similar to a callback with a context pointer, which is a pretty popular idiom in C; a closure just encapsulates the context pointer much like a C++ object does for its methods). I use this all the time in Python; great for generating tiny local functions to thunk a string into the right format, too.