From: James Edward Gray II <james@...>
Date: 2005-09-17T00:17:10+09:00
Subject: Re: Hash table questions

On Sep 16, 2005, at 10:11 AM, EdUarDo wrote:

> Hi all,
>
> I'm filling up a hash table reading data from a file.
>
> coords = {}
> File.open('/home/eyp/socceralive/lib/model/zones.dat') do |file|
>     while !file.eof? do
>         pos = file.readline
>         line = file.readline
>         data = line.split(';')
>             coords.store(pos, {:CENTER=>data[0], :RIGHT=>data 
> [1], :LEFT=>data[2]})
>     end
> end
>
> The content oh the hash table is:
>
> coords.each do |key, value|
>     puts key, value
> end
>
> DC
> CENTER2,8,6,10RIGHT0,8,3,10LEFT5,8,8,10
> MP
> CENTER3,5,7,8RIGHT5,5,8,8LEFT0,5,3,8
> M
> CENTER2,3,6,7RIGHT5,3,8,7LEFT0,3,3,7
> DF
> CENTER2,0,6,4RIGHT6,0,8,4LEFT0,0,2,4
> CD
> CENTER2,2,6,5RIGHT1,2,5,5LEFT3,2,7,5
>
> So I suppose hash table has a 'DC' key, but these sentences return  
> 'false'
>
> @position.post = :DC
> puts coords.has_key?(@position.post.to_s)
> puts coords.has_key?(@position.post)
> puts coords.has_key?('DC')
>
> Why I can't access 'DC' key with @position.post?

I suspect it's because the DC key had trailing whitespace, probably a  
newline character.  Try changing the reads to something like:

         pos = file.readline.strip
         line = file.readline.strip

Hope that helps.

James Edward Gray II