A way to chain class methods

gistfile1.rb

class X
  def self.m1
    puts "m1 called"
    self
  end
  def self.m2
    puts "m2 called"
    self
  end
end

X.m1
X.m2
puts
X.m1.m2
X.m2.m1

# Produced output:
# m1 called
# m2 called

# m1 called
# m2 called
# m2 called
# m1 called