[Haskell-cafe] Stack ADT?
sebf at informatik.uni-kiel.de
Thu Feb 4 12:16:19 EST 2010
On Feb 4, 2010, at 6:07 PM, michael rice wrote:
> Can't find a Stack datatype on Hoogle? Where should I look?
Could not find one on Hackage either. Probably because its so easy to
handcraft your own:
newtype Stack a = Stack [a]
emptyStack = Stack 
isEmptyStack (Stack xs) = null xs
push x (Stack xs) = Stack (x:xs)
pop (Stack (_:xs)) = Stack xs
top (Stack (x:_)) = x
I saw such stacks in Haskell only for educational purposes. Usually,
people seem to use lists directly.
Underestimating the novelty of the future is a time-honored tradition.
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