From: "Einar Magnús Boson" <einarmagnus@...>
Date: 2008-11-17T16:46:25+09:00
Subject: Re: How can I overload a method in Ruby

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there is no overloading, only overriding.


You can have variable number of arguments by writing

def fun(*params)
   #here params is an array of your arguments, [] if none.
end

you can also have a default value for your parameter:

class Impl
  include MyModule

  def fun(directory = "")
       puts "fun #{directory}"
  end

end
m=Impl.new()
m.fun()
# >> fun
m.fun "/dev/null"
# >> fun /dev/null"

On 17.11.2008, at 07:26 , Zhao Yi wrote:

> This is my class definition:
> class Impl
>  include MyModule
>  def fun()
>    puts ("fun")
>  end
>
>  def fun(directory)
>    puts ("fun directory")
>  end
> end
> m=Impl.new()
> m.fun()
>
> When I run this program, I got this error:
>
> class_objects/module.rb:22:in `fun': wrong number of arguments (0  
> for 1)
> (ArgumentError)
>  from class_objects/module.rb:22
>
> I declared two methods with the same name but different parameters.  
> Why
> can't ruby support overload method?
> -- 
> Posted via http://www.ruby-forum.com/.
>


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