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POWhat can be improved on my first haskell program?
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<p>Here is my first Haskell program. What parts would you write in a better way?</p> <pre><code>-- Multiplication table -- Returns n*n multiplication table in base b import Text.Printf import Data.List import Data.Char -- Returns n*n multiplication table in base b mulTable :: Int -> Int -> String mulTable n b = foldl (++) (verticalHeader n b w) (map (line n b w) [0..n]) where lo = 2* (logBase (fromIntegral b) (fromIntegral n)) w = 1+fromInteger (floor lo) verticalHeader :: Int -> Int -> Int -> String verticalHeader n b w = (foldl (++) tableHeader columnHeaders) ++ "\n" ++ minusSignLine ++ "\n" where tableHeader = replicate (w+2) ' ' columnHeaders = map (horizontalHeader b w) [0..n] minusSignLine = concat ( replicate ((w+1)* (n+2)) "-" ) horizontalHeader :: Int -> Int -> Int -> String horizontalHeader b w i = format i b w line :: Int -> Int -> Int -> Int -> String line n b w y = (foldl (++) ((format y b w) ++ "|" ) (map (element b w y) [0..n])) ++ "\n" element :: Int -> Int -> Int -> Int -> String element b w y x = format (y * x) b w toBase :: Int -> Int -> [Int] toBase b v = toBase' [] v where toBase' a 0 = a toBase' a v = toBase' (r:a) q where (q,r) = v `divMod` b toAlphaDigits :: [Int] -> String toAlphaDigits = map convert where convert n | n < 10 = chr (n + ord '0') | otherwise = chr (n + ord 'a' - 10) format :: Int -> Int -> Int -> String format v b w = concat spaces ++ digits ++ " " where digits = if v == 0 then "0" else toAlphaDigits ( toBase b v ) l = length digits spaceCount = if (l > w) then 0 else (w-l) spaces = replicate spaceCount " " </code></pre>
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<haskell><coding-style>
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What can be improved on my first haskell program?
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1. CODo you have tests? They might reveal some improvements on their own.
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