Ruby prepend simple example

prepend_example.rb

module Example
  def something
    puts "in example"
    super
  end
end

class Test
  prepend Example
  def something
    puts "in test"
  end
end

# Prepend does what we would intuitively expect: the prepended module is the first ancestor for the sake of method lookup,
# and is before the prepending class in the ancestry tree.
Test.ancestors # => [Example, Test, Object, Kernel, BasicObject]

Test.new.something 
# >> in example
# >> in test