[silentbicycle]

I wonder if not getting first class functions is a consequence of already knowing too much, though. If you're thinking in C, you might get bogged down in thinking about passing around function pointers, but aside from implementation details, first class functions are not intimidating when the functions applied are familiar: "Take this list and do X to everything in it: square each number in a list of numbers, or convert every word to lowercase in a string list, or negate every bool in a bool list, etc.".

Euclid's algorithm is a really good example, by the way. Thanks.