c u r s e d

I use a hlinter for what goose mentioned, it basically formats my code whenever I save the file :D

Word of advice: you don't need to enclose toUpper c with parentheses; function application is "stickier" than any infix operator

Never knew Haskell could do parallel list comprehension, thanks for pointing it out!

d'oh... oh that silly trival reader monad. :)
thx!

s is available natively as (<*>).

should a Senior really have a handicap "worse" than 8 ? that is, if he becomes better, he won't be a Senior anymore?

yes-ish... it is not about "a double or a non-double" but about "just one double or nothing".

a Maybe Double differs from a Double.
a Maybe a is like a list of as with at most one element.

let me hoogle that for you... https://www.haskell.org/hoogle/?hoogle=Maybe