Nobody seems to add parens to separate arguments from function calls though in Haskell, never seen it but it works.

  let f(lst) = lst 
                & map normalize
                & filter (\x -> x > 0)
                & average

  Prelude Data.Function> let f(lst) = lst & map (\x -> x + 2) & filter (\x -> x > 4)
  Prelude Data.Function> f([2,3,4])
  [5,6]

    filter ( > 0)