Ruby mixin behavior

gistfile1.rb

module A
  def do_something
    puts "In A"
  end
end

module B
  def do_something_else
    puts "In B"
  end
end

class MyClass
  include A
  include B
  
  def do_something
    puts "In MyClass"
  end
end

a = MyClass.new
def a.do_something
  puts "in local instance"
end

a.do_something
# => in local instance