Arguments

class Argy
  def initialize = (@args = ARGV)
  [:first, :second].each_with_index {|n,i|
    define_method :"#{n}" do; @args[i] || nil; end
  }
end

args = Argy.new

puts (args.first && args.second) ?
  'two args (or more): %s & %s' % [args.first, args.second] :
  (args.first) ? 'one arg: %s' % args.first : 'no arg'

Just a test on command line arguments.
The class is defining two methods (:first and :second), that returns ARGV[0] OR nil or ARGV[1] OR nil respectively.

Then a double ternary if is reporting ’two or more args’, ‘one arg’ or ’no args’.