I'm curious about the expression flip id (It's not homework: I found it in the getOpt documentation).

I wonder why it has this type:

Prelude> :t (flip id)
(flip id) :: b -> (b -> c) -> c

For example, (flip id) 5 (+6) gives 11.

I know why id (+6) 5 gives 11, but I don't "get" the flip id thing.

I tried to figure this out myself using pen and paper but couldn't. Could anybody please explain this to me? I mean, how does flip id come to have the type b -> (b -> c) -> c ?

haskell
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