How to compare versions in Ruby?

Question

How to write a piece of code to compare some versions strings and get the newest?

For example strings like: \'0.1\', \'0.2.1\', \'0.44\'.

Answer 1

class Version < Array
  def initialize s
    super(s.split('.').map { |e| e.to_i })
  end
  def < x
    (self <=> x) < 0
  end
  def > x
    (self <=> x) > 0
  end
  def == x
    (self <=> x) == 0
  end
end
p [Version.new('1.2') < Version.new('1.2.1')]
p [Version.new('1.2') < Version.new('1.10.1')]