#7203: Add scanl'
------------------------------+---------------------------------------------
Reporter: nh2 | Owner:
Type: feature request | Status: new
Priority: normal | Component: libraries/base
Version: 7.7 | Keywords: scanl
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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The presence of foldl' and foldl1' suggests the addition of scanl' (and
scanl1') to Data.List:
{{{
scanl' :: (a -> b -> a) -> a -> [b] -> [a]
scanl' f q ls = q `seq` (q : (case ls of
[] -> []
x:xs -> scanl' f (f q x) xs))
}}}
This would finally sort out the infamous (last . scanl) problem.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7203>
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The Glasgow Haskell Compiler
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