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-rw-r--r--Library/Stack.hs50
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diff --git a/Library/Stack.hs b/Library/Stack.hs
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--- a/Library/Stack.hs
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-module Library.Stack (
- Stack,
- empty,
- at,
- pop,
- (<:>),
- size,
- diff
- ) where
-
-
-import Data.List
-
-
-data Stack a = Stack [a] deriving (Eq)
-
-
-instance Show a => Show (Stack a) where
- show (Stack x) = "Stack:\n" ++ intercalate "\n" (map (show) x) ++ "\n\n"
-
-
-infixr 9 <:>
-
-
-empty :: Stack a
-empty = Stack []
-
-
-at :: Stack a -> Int -> Maybe a
-at (Stack list) index =
- if (index < length list && index >= 0)
- then Just (list!!index)
- else Nothing
-
-
-pop :: Int -> Stack a -> Stack a
-pop n (Stack list) = Stack (drop n list)
-
-
-(<:>) :: a -> Stack a -> Stack a
-x <:> (Stack list) = Stack (x : list)
-
-
-size :: Stack a -> Int
-size (Stack list) = length list
-
-
-diff :: (Eq a) => Stack a -> Stack a -> Stack a
-diff (Stack one) (Stack two) = Stack (one \\ two)
-