= Quicksort in Haskell
The first thing to know about Haskell's syntax is that parentheses
are used for grouping, and not for function application.

```haskell
quicksort :: Ord a => [a] -> [a]
quicksort []     = []
quicksort (p:xs) = (quicksort lesser) ++ [p] ++ (quicksort greater)
    where
        lesser  = filter (< p) xs
        greater = filter (>= p) xs
```

The parentheses indicate the grouping of operands on the 
right-hand side of equations.