add (<&>), fixes issue #53 (#56)

docs/Functor.md

@@ -35,6 +35,7 @@ void :: Functor f => f a -> f ()
 
 ```haskell
 foreach :: Functor f => f a -> (a -> b) -> f b
+(<&>)   :: Functor f => f a -> (a -> b) -> f b
 ```
 
 

src/Protolude.hs

@@ -16,7 +16,7 @@ module Protolude (
   print,
   throwIO,
   throwTo,
-  foreach,
+  foreach, (<&>),
   show,
   pass,
   guarded,
@@ -570,6 +570,13 @@ throwTo tid e = liftIO (Control.Exception.throwTo tid e)
 foreach :: Functor f => f a -> (a -> b) -> f b
 foreach = flip fmap
 
+-- | Infix version of foreach.
+--
+-- @<&>@ is to '<$>' what '&' is to '$'.
+infixl 4 <&>
+(<&>) :: Functor f => f a -> (a -> b) -> f b
+(<&>) = foreach
+
 -- | Do nothing returning unit inside applicative.
 pass :: Applicative f => f ()
 pass = pure ()