From: Dr Nic <drnicwilliams@...>
Date: 2006-07-25T20:14:44+09:00
Subject: Re: Defining a method with an argument with a default value

You could do the following:

Foo.class_eval do
  def bar(tar=0)
    tar * 2
  end
end

Foo.new.tar
=> 0
Foo.new.tar 4
=> 8

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