What's more important is applying some important concepts in haskell - functional programming and dividing your program into tiny self-contained parts. You can

What's more important is applying some important concepts in haskell - functional programming and dividing your program into tiny self-contained parts. You can write this way in most languages - Ruby, Python, Scala, etc. The fancier parts of Haskell - lazy evaluation, static typing, whatever - are less important to making software that works than its functional nature.