(a -> b) -> [a] -> [b] -base -parallel -syb

($!!) :: NFData a => (a -> b) -> a -> b
deepseq Control.DeepSeq
the deep analogue of $!. In the expression f $!! x, x is fully evaluated before the function f is applied to it.
(<<) :: HTML a => (Html -> b) -> a -> b
html Text.Html
(<<) :: HTML a => (Html -> b) -> a -> b
xhtml Text.XHtml.Strict, xhtml Text.XHtml.Frameset, xhtml Text.XHtml.Transitional
Put something inside an HTML element.
local :: MonadReader r m => (r -> r) -> m a -> m a
mtl Control.Monad.Reader.Class, mtl Control.Monad.Reader
censor :: MonadWriter w m => (w -> w) -> m a -> m a
mtl Control.Monad.Writer.Class, mtl Control.Monad.Writer.Lazy, mtl Control.Monad.Writer.Strict
censor f m is an action that executes the action m and applies the function f to its output, leaving the return value unchanged. *  f m = pass (liftM (\x -> > (x,f))