[Haskell-cafe] Missing `$` like operators in Haskell

Clinton Mead clintonmead at gmail.com
Fri Dec 12 02:47:49 UTC 2014


Below are the `$` like operators in Haskell (view in fixed width):


---------------------------------------------------------------------
          | Function first           | Op   | Function second          | Op
  |
-------------------------------------------------------------------------------
| Plain   | (a -> b)   -> a   -> b   | $    | a   -> (a -> b)   -> b   |
   |
| Functor | (a -> b)   -> f a -> f b | <$>  | f a -> (a -> b)   -> f b |
   |
| Applicat| f (a -> b) -> f a -> f b | <*>  | f a -> f (a -> b) -> f b |
<**> |
| Monad   | (a -> m b) -> m a -> m b | =<<  | m a -> (a -> m b) -> m b |
>>=  |
-------------------------------------------------------------------------------

The "function second" forms I couldn't find for "plain" and "functor".
What are the most common operators to used in these places?
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