Validates numbers using the Luhn algorithm (mod 10).
The Luhn algorithm is a checksum formula used to validate identification numbers such as credit card numbers, IMEI numbers, and others.
Supports arbitrary bases (default base 10).
Examples
iex> Luhn.valid?("378282246310005")
true
iex> Luhn.valid?(4111111111111111)
true
iex> Luhn.valid?("abc1239", 16)
true
iex> Luhn.valid?("1234567890")
falseSummary
Functions
Calculates the Luhn checksum for the given number.
Checks whether the given number is valid according to the Luhn algorithm.
Functions
@spec checksum(integer() | String.t(), pos_integer()) :: non_neg_integer()
Calculates the Luhn checksum for the given number.
Returns 0 if the number is valid. Accepts strings or integers.
Examples
iex> Luhn.checksum("378282246310005")
0
iex> Luhn.checksum("123456789123456")
8@spec valid?(integer() | String.t(), pos_integer()) :: boolean()
Checks whether the given number is valid according to the Luhn algorithm.
Accepts either a string or integer representation of the number.
An optional base parameter can be provided (defaults to 10).
Examples
iex> Luhn.valid?("378282246310005")
true
iex> Luhn.valid?(378282246310005)
true
iex> Luhn.valid?(0xABC1239, 16)
true
iex> Luhn.valid?("123456789123456")
false