Specs

checksum(binary(), integer()) :: integer()

checksum(integer(), integer()) :: integer()

Calculate the checksum of a number.

This is known as the "mod 10" algorithm and the result will be zero if the check digit suffix is valid for the number.

iex> Luhn.checksum("79927398713")
0

Specs

valid?(number :: integer() | String.t(), base :: integer()) :: boolean()

Evaluates a given credit card number for its validity, with an optionally provided base.

Examples

# Accepts a string
iex(1)> Luhn.valid?("378282246310005")
true

# Or an integer
iex(2)> Luhn.valid?(378282246310005)
true