[Haskell-beginners] Understanding the function monad ((->) r)

[Olumide]

Hello List,

I am having enormous difficulty understanding the definition of the bind 
operator of ((->) r) as show below and would appreciate help i  this regard.

instance Monad ((->) r) where
     return x = \_ -> x
     h >>= f = \w -> f (h w) w

Thanks,

- Olumide