From: 7stud -- <bbxx789_05ss@...>
Date: 2007-10-28T03:13:00+09:00
Subject: Re: .each do |foo, bar|     what does bar do?

David A. Black wrote:
> 
> If you were going to write Hash#each in Ruby, without recourse to
> #each, you could write it like this:
> 
> class Hash
>    def each
>      keys = self.keys   # make a 'keys' local variable
>      i = 0
>      until i == keys.size
>        key = keys[i]
>        yield(key, self[key])
>        i += 1
>      end
>      self
>    end
> end
> 
>
> David

A test run:

h = {"a"=>1, "b"=>2}
h.each do |arr|
  p arr
end

--output:--
r5test.rb:2: warning: method redefined; discarding old each
r5test.rb:15: warning: multiple values for a block parameter (2 for 1)
        from r5test.rb:7
["a", 1]
r5test.rb:15: warning: multiple values for a block parameter (2 for 1)
        from r5test.rb:7
["b", 2]


>7stud -- wrote:
> 
> The each() method for a hash sends an array consisting of a key/value 
> pair to a block:
> 
> h = {"a"=>1, "b"=>2}
> 
> h.each do |arr|
>   p arr
> end
> 
> --output:--
> ["a", 1]
> ["b", 2]
> 
> 
> The output shows that each() *assigns* an array to the parameter 
> variable 'arr'. 
-- 
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