While I was hanging out in the Python chatroom, someone dropped in and reported the following exception: NameError: free variable 'var' referenced before assignment in enclosing scope I'd never se...

Can anyone explain the concept of free variables in Prolog. Is it similar to anonymous variables ? Or is there a difference. Also could be great if an example is given to explain.

Javascript closure definition says : A "closure" is an expression (typically a function) that can have free variables together with an environment that binds those variables (that "closes" the...

I've been programming for a long time (too long, actually), but I'm really struggling to get a handle on the terms "Free Variables" and "Bound Variables". Most of the "explanations" I've found onl...

For example, a referentially transparent function with no free variables: g op x y = x `op` y A now now a function with the free (from the point-of-view of f) variables op and x: x = 1 op = (+...

I was just doing some homework for my upcoming OCaml test and I got into some trouble whatnot. Consider the language of λ-terms defined by the following abstract syntax (where x is a variable): ...