gistfile1.txt

[tene@vrici ~]$ ghci
GHCi, version 8.0.2: http://www.haskell.org/ghc/  :? for help
Prelude> :t foldl
foldl :: Foldable t => (b -> a -> b) -> b -> t a -> b
Prelude> let x = [(+2),(+3),(+4)]
Prelude> :t x
x :: Num a => [a -> a]
Prelude> :t ($)
($) :: (a -> b) -> a -> b
Prelude> :t flip ($)
flip ($) :: a -> (a -> c) -> c
Prelude> :t foldl (flip ($))
foldl (flip ($)) :: Foldable t => a -> t (a -> a) -> a
Prelude> :t foldl (flip ($)) 0 x
foldl (flip ($)) 0 x :: Num a => a
Prelude> foldl (flip ($)) 0 x
9