Initializing instance variables in Mixins

Question

Is there any clean way to initialize instance variables in a Module intended to be used as Mixin? For example, I have the following:

module Example

  def on(..         


        

Answer 1

Perhaps this is a little hacky, but you can use prepend to get the desired behavior:

module Foo
  def initialize(*args)
    @instance_var = []
    super
  end
end

class A
  prepend Foo
end

Here is the output from the console:

2.1.1 :011 > A.new
 => #