30 lines
868 B
Haskell
30 lines
868 B
Haskell
{- |
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mtlstats
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Copyright (C) 2019 Rhéal Lamothe
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<rheal.lamothe@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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-}
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module Mtlstats.Util (nth) where
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nth :: Int -> [a] -> Maybe a
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nth _ [] = Nothing
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nth n (x:xs)
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| n == 0 = Just x
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| n < 0 = Nothing
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| otherwise = nth (pred n) xs
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