Sha256: 05a425c664131342e3e9c1733e1dc8c32e5560bfaec140e7cbb9f3a6d2f7b276
Contents?: true
Size: 300 Bytes
Versions: 16
Compression:
Stored size: 300 Bytes
Contents
# coding: utf-8
class Integer
def parasitic?(n=nil)
return (1..9).any?{|x| parasitic?(x)} if n.nil?
return true if (n == 1 && self == 1)
return false unless self > 9
raise ArgumentError unless (n.positive? && n < 10)
(n*self) == [digits.last, digits[0..-2]].join.to_i
end
end
Version data entries
16 entries across 16 versions & 1 rubygems