An infix synonym for

fmap.
The name of this operator is an allusion to

$. Note the
similarities between their types:

($) :: (a -> b) -> a -> b
(<$>) :: Functor f => (a -> b) -> f a -> f b

Whereas

$ is function application,

<$> is function
application lifted over a

Functor.

**Examples**

Convert from a

`Maybe Int` to a

`Maybe
String` using

show:

>>> show <$> Nothing
Nothing
>>> show <$> Just 3
Just "3"

Convert from an

`Either Int Int` to an

`Either Int` String using

show:

>>> show <$> Left 17
Left 17
>>> show <$> Right 17
Right "17"

Double each element of a list:

>>> (*2) <$> [1,2,3]
[2,4,6]

Apply

even to the second element of a pair:

>>> even <$> (2,2)
(2,True)