NOTE: this package is not compatible with Elm 0.19.1

README About Versions Source Modules

Mod10

This library helps you create and verify numeric strings according to the Modulus 10 algorithm.

Verify

verify : String -> Bool

Verfify a numeric string with the Modulus 10 algorithm.

verify "79927398713" == True
verify "79927398712" == False
verify "nonsense" == False

Calculate

calculate : String -> Maybe Char

Calculate the "check digit" for a numeric string.

calculate "7992739871" == Just '3'
calculate "nonsense" == Nothing

Modules

Mod10