Sha256: b19325cf27d9954716ebf3c995dd444c169783af6b853c7cc7867b3d2301f8ea
Contents?: true
Size: 488 Bytes
Versions: 242
Compression:
Stored size: 488 Bytes
Contents
class Luhn
DOUBLE = [0, 2, 4, 6, 8, 1, 3, 5, 7, 9]
DOUBLE.freeze
def self.valid?(string)
Luhn.new(string).valid?
end
def initialize(string)
@string = string.tr(' ', '')
end
def checksum
@string.
reverse.each_char.with_index.
reduce(0) {|sum, (c, i)| sum + (i.odd? ? DOUBLE[c.to_i] : c.to_i) }
end
def valid?
clean? && (checksum % 10).zero?
end
def clean?
@string.match(/^\d{2,}$/)
end
end
module BookKeeping
VERSION = 1
end
Version data entries
242 entries across 242 versions & 1 rubygems