Haskell: Write a function that computes number of elements in list

listUtil.hs

lengthOfList :: [a] -> Integer
lengthOfList [] = 0
lengthOfList (x:xs) = 1 + lengthOfList xs

*Main> :load listUtil.hs
[1 of 1] Compiling Main             ( listUtil.hs, interpreted )
Ok, modules loaded: Main.
*Main> 
*Main> lengthOfList []
0
*Main> 
*Main> lengthOfList [2, 3, 5, 7]
4
*Main> 
*Main> lengthOfList ["Hello", "How", "are", "you"]
4
*Main> 

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