Well ofc yours is slower because sorting is O(n log n)

This one is nuttier :-)

Thanks!

It's too quick. My regards!

LoL :D

Because the function may not work with arrays with 2 components. If an array have two components, they already are their maximum and minimum values, which invalidate the kata's request.

Don't know. It'll work this way as well, however when I was completing this kata I thought it was a good idea :)

if letter == "x" or "X":

You need to put "letter ==" in your 2nd logical expression (in front of the "X").
If you don't then it will practically means:

if (letter == "x") or ("X" != 0)
...which will always be TRUE, since "X" ascii is not 0.

which language you used?