Once you get used to it, the overwhelming majority of cases you don't actually need to manually write recursive style functions - you start thinking in terms of `map`, `zip`, `unzip` `fold`, `unfold`, `scan`, `init`, `filter`, `take` and `drop`. There are various other related methods but they can usually all be implemented in terms of these. As for non-recursive styles of iteration, I use F# as my primary language and every time I write a loop I have to consult the manual to remind myself of the exact syntax because it's so rare that I actually use them. Usually `iter` does the trick.