#12044: Remove sortWith in favor of sortOn -------------------------------------+------------------------------------- Reporter: cblp | Owner: cblp Type: feature request | Status: patch Priority: normal | Milestone: Component: libraries/base | Version: 7.10.3 Resolution: | Keywords: newcomer Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Other | Test Case: Blocked By: | Blocking: Related Tickets: #2659 | Differential Rev(s): Phab:D2587 Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari):
Somebody should investigate and document when one should use `sortOn` or `sortWith`.
In general if the mapping function is expensive to compute then you should probably be using `sortOn`, as it only needs to compute it once for each element. `sortWith`, on the other hand must compute the mapping function for every comparison that it performs. Beyond that general intuition it's hard to give any specific prescription. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12044#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler