the best intro to writing Haskell for me was writing Elm. The best intro to writing Elm was writing pointfree Codewars kata solutions in JS using

    with(require("ramda")) fn = pipe(…)

And yep, you end up with a lot of folds (well, reduces) where that ellipsis is. Or related functions that are really folds.

For those wondering `with` in JS is a bit like `extract` in PHP except it creates a new context right after itself rather than modify the context it finds itself in. It's super deprecated because it's inscrutable and silly except in this case and/or when you need to solve Codewars katas in a limited number of characters.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

https://www.php.net/manual/en/function.extract.php

EDIT ramda is a nice utility library in JS that supports partial application of arguments in arbitrary order https://ramdajs.com/docs/#subtract