From: Andrea Dallera <andrea@...>
Date: 2010-04-12T03:28:28+09:00
Subject: Re: Method call within a class

Hei,

	"each"'s receiver will be an instance of a class that includes the
module Enumerable and "size"'s receiver will be an instance of the class
Array. Example:

array = Array.new
p array.size # => 0

class MyEnumerable
  include Enumerable

end

foo = MyEnumerable.new
foo.each_with_index # doesn't raise, the method is defined

HTH

-- 
Andrea Dallera
http://github.com/bolthar/freightrain
http://usingimho.wordpress.com


On Mon, 2010-04-12 at 02:48 +0900, Li Chen wrote:
> Hi all,
> 
> Maybe I miss something. But I am confused about method call within a
> class. What is the format for that? I just copy some code segments from
> the forum as follows:
> 
> module Enumerable
>  def each_with_index
>    i = 0
>     each do |elem|
>        yield elem, i
>       i += 1
>     end
>   end
>  end
> 
> class Array
>    def each_with_index
>     size.times do |i|
>       yield self[i], i
>      end
>    end
> end
> 
> So
> 1) which one is the reciever for "each"?
> 2) which one is the reciever for "size"?
> 
> Do they default to self?
> 
> Thanks,
> 
> Li