That's weird.. I just had an SML class and we never learned it was call folding... It was just being recursive on a list. Also, the way the website is made the

That's weird.. I just had an SML class and we never learned it was call folding... It was just being recursive on a list. Also, the way the website is made the list seems to be infinite (stream) which is impossible in SML only in Haskell.