CUSIP: Difference between revisions
m
→{{header|Haskell}}
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Line 1,898:
</pre>
Or,
<lang Haskell>import qualified Data.Map as M (Map, fromList, lookup)
import Data.Maybe (fromMaybe)
-------------------------- CUSIP -------------------------
cusipMap :: M.Map Char Int
cusipMap =
cusipMap = M.fromList $ zip (['0' .. '9'] ++ ['A' .. 'Z'] ++ "*@#") [0 ..]▼
M.fromList $
cusipValid :: String -> Bool
cusipValid s =
let ns = (fromMaybe [] . traverse (`M.lookup` cusipMap)) s
in (9 == length ns)
&& let qrSum =
sum $
id
(cycle [id, (* 2)])
(take 8 ns)
)
<*> [10]
in last ns == rem (10 - rem qrSum 10) 10
--------------------------- TEST -------------------------
main :: IO ()
main =
mapM_
(print . ((,) <*> cusipValid))
[ "037833100",
]</lang>
{{Out}}
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