Sha256: 266bb45ea147f76b6146c6b0f4212b664cd7db7d5039a472fceef14523ca9d97
Contents?: true
Size: 433 Bytes
Versions: 106
Compression:
Stored size: 433 Bytes
Contents
module BookKeeping
VERSION = 1
end
class IsbnVerifier
def self.valid?(str)
return false unless /\A\d-?\d{3}-?\d{5}-?[\dX]\z/.match(str)
result = str
.gsub("-", "")
.chars
.map { |char|
char.gsub("X","10")
}
.zip(10.downto(1))
.map { |number, index|
number.to_i * index
}
.reduce(0){ |sum, digit|
sum + digit
}
result % 11 == 0
end
end
Version data entries
106 entries across 106 versions & 1 rubygems