Are you implying it's complex? Because a lot of languages have list comprehensions[1] (list comprehensions are awesome!). Haskells is very close to the mathmatical set-builder notation[2].

An example of a more advanced one would be

    >> [2*x | x <- [0,1..25], x^2 `rem` 3 == 0]
    [0,6,12,18,24,30,36,42,48]

Also, there is HLint for Haskell linting purposes...

[1] http://en.wikipedia.org/wiki/List_comprehension#Examples_in_...

[2] http://en.wikipedia.org/wiki/Set-builder_notation#Parallels_...