#9623: Use Data.List.dropWhileEnd -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: task | Status: new Priority: normal | Milestone: 7.10.1 Component: libraries | Version: 7.8.3 (other) | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Easy (less than 1 Unknown/Multiple | hour) Type of failure: | Blocked By: None/Unknown | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by dfeuer): Criterion has spoken. `dropWhileEnd isSpace` seems to be much slower in typical cases than even `reverse . dropWhile isSpace . reverse`. Even a faster predicate, `(== ' ')`, gives a (much smaller) disadvantage to `dropWhileEnd`. However, the above `dropWhileEndLE` appears to be faster than the double reverse in all cases. So I'll add it to the utilities module and use that instead. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9623#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler