luhn v0.3.3 Luhn

Functions for validating Credit Card numbers using Luhn checksums.

Credit card numbers may be of arbitrary length and in arbitrary base.

Link to this section Summary

Functions

checksum(number, base \\ 10)

double(list, base, acc)

valid?(number, base \\ 10)

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

Link to this section Functions

checksum(number, base \\ 10)

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

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

double(list, base, acc)

double([integer(), ...], integer(), integer()) :: integer()

valid?(number, base \\ 10)

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

# Works with Hexadecimal as well
iex(3)> Luhn.valid?(0x1580BB2EA8875, 16)
true