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

[Dan Burton]

The lens package defines (&) and (<&>) as flipped ($) and (<$>),
respectively. There is nothing in the base package that defines those. <&>
is quite uncommon. Flipped ($) is something that crops up here and there.
Sometimes called (|>), or (#).

-- Dan Burton

On Thu, Dec 11, 2014 at 6:47 PM, Clinton Mead <clintonmead at gmail.com> wrote:

> 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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