From: Mmcolli00 Mom <mmc_collins@...>
Date: 2009-01-16T04:57:25+09:00
Subject: Re: undefined method `[]' for nil:NilClass - how to prevent?

Brian Thanks!! Your code does exactly what I am needing it to do. Thanks 
for taking out the duplicates also. You are very skillful!

This error occurred:
I'll am looking to see if maybe I am missing a gem, not sure.

>Value does not contain a match: Clashifting.rb:55: undefined method `+' for >nil:NilClass (NoMethodError)
>  from shifting.rb:143:in `each_with_index'
>  from shifting.rb:54:in `each'
>  from shifting.rb:54:in `each_with_index'
>  from shifting.rb:54
>  from shifting.rb:53:in `each_line'
>  from shifting.rb:53
>  from shifting.rb:52:in `open'
>  from shifting.rb:52

snippet of your code:

File.open("temp.txt") do |src|
  src.each_line do |line|
    line.chomp.split(",").each_with_index do |word, i|
    counts[word][i] += 1 #line 55
    end
  end
end
counts.each do |word, cols|
  if cols.uniq.size != 1
    puts "Word #{word.inspect} occurs different times: #{cols.inspect}"
  end
end
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