From: Michael Guterl <mguterl@...>
Date: 2006-07-09T23:45:37+09:00
Subject: Re: why does block know about one instance variable and not the other?

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Hi,

On 7/9/06, anne001 <anne@wjh.harvard.edu> wrote:
>
> I can't find what the problem is with @foundinfo: since it is defined
> outside a block, the block should find it no? @item is defined outside
> the second block and that second block finds it. What is @item and
> @foundinfo different?
>
> Do I have a typo I don't see, or it there a principle of the thing?
>
> Here is my simplified code with debugging puts
>
> class Linear
>
  @foundinfo=Hash.new
>   p " 1. debugging @foundinfo created"
>   p @foundinfo.class   #this is ok


You should wrap the above section in the initialize method, like so.

def initialize
  @foundinfo = Hash.new
  p " 1. debugging @foundinfo created"
  p @foundinfo.class   #this is ok
end

  def run
>
>     data="hello dud"
>     data.split(/</).each do |line|
>        line =~ /d(.)d/
>         @item=$1
>         p "2. debugging, @foundinfo found?"
>         p @foundinfo.class   # this is not ok, @foundinfo not found
>
>         lines="and so on and some more"
>         lines.split(/</).each do |chunk|
>                p  "3. debugging, @item found?"
>                p @item       #this is ok, @item found
>                p "3. debugging, @foundinfo found?"
>                p @foundinfo.class  # this is still not ok, @foundinfo
> not found
>         end  # end do chunk
>     end  # end do line
>   end # end run
>
> end # end class
>
> a=Linear.new
> a.run
>
>
>
Michael Guterl

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