Haskell: Calculate sum of all elements in a list

listUtil.hs

sumOfElements :: [Integer] -> Integer
sumOfElements [] = 0
sumOfElements (x:xs) = x + sumOfElements(xs)

*Main> :load listUtil.hs
[1 of 1] Compiling Main             ( listUtil.hs, interpreted )
Ok, modules loaded: Main.
*Main> 
*Main> sumOfElements []
0
*Main> 
*Main> sumOfElements [2, 3, 5, 7]
17
*Main> 
*Main> sumOfElements [2]
2
*Main> 

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