It may be defining of pure functional programming. But not for "functional programming". Some arguments for why (and indeed some discussion for why not, too !)

It may be defining of pure functional programming. But not for "functional programming". Some arguments for why (and indeed some discussion for why not, too !) : https://wiki.c2.com/?FunctionalProgramming https://wiki.c2.com/?FunctionalProgramming Ed: and I suppose if a function call allocates a stack frame it's no longer a pure function? Or are all functions of type crash-or-value?