#3399: Generalize the type of Data.List.{deleteBy, deleteFirstsBy}
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Reporter: iago | Owner:
Type: proposal | Status: new
Priority: normal | Component: libraries/base
Version: 6.10.4 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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Better (more general) type signatures would be
{{{
deleteBy :: (b -> a -> Bool) -> b -> [a] -> [a]
deleteFirstsBy :: (b -> a -> Bool) -> [b] -> [a] -> [a]
}}}
''Example of why it is useful'':
{{{
deleteBy ((==) . fst) 1 [(1,'a'), (2, 'b')]
}}}
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3399>
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