Multiplication tables: Difference between revisions
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table :: [Int] -> [[Maybe Int]] |
table :: [Int] -> [[Maybe Int]] |
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table xs = |
table xs = |
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(Nothing : axis) : |
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zipWith |
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in (Nothing : axis) : |
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(:) |
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axis |
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[ [ bool (Just (x * y)) Nothing (x > y) |
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axis |
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| y <- xs ] |
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| x <- xs ] |
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where |
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axis = Just <$> xs |
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-- |
--------------------------- TEST --------------------------- |
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main :: IO () |
main :: IO () |
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main = |
main = |
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(putStrLn . unlines) $ |
(putStrLn . unlines) $ |
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showTable . table <$> [[13 .. 20], [1 .. 12], [95 .. 100]] |
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-- |
------------------------ FORMATTING ------------------------ |
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showTable :: [[Maybe Int]] -> String |
showTable :: [[Maybe Int]] -> String |
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showTable xs = |
showTable xs = unlines $ head rows : [] : tail rows |
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where |
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w = 1 + (length . show) (fromMaybe 0 $ (last . last) xs) |
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gap = replicate w ' ' |
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gap = replicate w ' ' |
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rows = (maybe gap (rjust w ' ' . show) =<<) <$> xs |
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in unlines $ head rows : [] : tail rows |
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rjust :: Int -> Char -> String -> String |
rjust :: Int -> Char -> String -> String |
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rjust n c = (drop . length) <*> (replicate n c ++) |
rjust n c = (drop . length) <*> (replicate n c ++)</lang> |
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</lang> |
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{{Out}} |
{{Out}} |
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<pre> 13 14 15 16 17 18 19 20 |
<pre> 13 14 15 16 17 18 19 20 |
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