Created
July 5, 2017 14:51
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| import Data.List | |
| onOdds :: ([a] -> [a]) -> [a] -> [a] | |
| onOdds f xs = | |
| let | |
| (odds, evens) = partition (odd . fst) $ zip [0..] xs | |
| in | |
| concat $ | |
| zipWith | |
| (\a b -> [a, b]) | |
| (snd <$> evens) | |
| (f $ snd <$> odds) |
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