#15566: Implement minimumOn, maximumOn to mirror sortOn -------------------------------------+------------------------------------- Reporter: Garciat | Owner: (none) Type: feature | Status: new request | Priority: normal | Milestone: Research needed Component: | Version: 8.5 libraries/base | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- By importing Data.List, we currently get: {{{#!hs sortBy :: (a -> a -> Ordering) -> [a] -> [a] maximumBy :: Foldable t => (a -> a -> Ordering) -> t a -> a minimumBy :: Foldable t => (a -> a -> Ordering) -> t a -> a sortOn :: Ord b => (a -> b) -> [a] -> [a] }}} I believe sortOn to be a very useful 'shortcut'. In that spirit, I propose we add: {{{#!hs maximumOn :: (Foldable t, Ord b) => (a -> b) -> t a -> a minimumOn :: (Foldable t, Ord b) => (a -> b) -> t a -> a }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15566 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler