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alogic0/FillScreenWithDigits.hs

Last active June 12, 2018 12:00
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Funny Haskell. try to run `matrix 2 (7^12345)` in ghci
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FillScreenWithDigits.hs
import Data.Char (digitToInt)
import Data.List (unfoldr)
import Data.Tuple (swap)
bin2dec :: String -> Integer
bin2dec = foldl (\d i -> d*2 + i) 0 . map (toInteger . digitToInt)
-- dec2bin = reverse . map intToDigit . unfoldr (test . swap . flip divMod 2) where test x = if x == (0,0) then Nothing else Just x
matrix b = unfoldr (test . swap . flip divMod b) where test x = if x == (0,0) then Nothing else Just x
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