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chris-martin/isHex.hs

Created February 21, 2018 19:04
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isHex.hs
isHex :: Word8 -> Bool
isHex w =
(w >= 48 && w <= 57) || -- '0' to '9'
(w >= 97 && w <= 102) || -- lower-case 'a' to 'f'
(w >= 65 && w <= 70) -- upper-case 'A' to 'F'
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