Difference between revisions of "99 questions/Solutions/2"
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(copied solution from Editing 99 questions/1 to 10) |
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myButLast''' (x:(_:[])) = x |
myButLast''' (x:(_:[])) = x |
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myButLast''' (_:xs) = myButLast''' xs |
myButLast''' (_:xs) = myButLast''' xs |
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+ | |||
+ | myButLast'''' = head . tail . reverse |
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</haskell> |
</haskell> |
Revision as of 14:38, 25 October 2011
(*) Find the last but one element of a list.
myButLast :: [a] -> a
myButLast = last . init
myButLast' x = reverse x !! 1
myButLast'' [x,_] = x
myButLast'' (_:xs) = myButLast'' xs
myButLast''' (x:(_:[])) = x
myButLast''' (_:xs) = myButLast''' xs
myButLast'''' = head . tail . reverse