From: Roberto Casadei <robyonrails@...>
Date: 2008-03-19T15:38:58+09:00
Subject: Undefined method '<' for nil:NilClasse

This is the code:
class StringScanner
  @str = ""
  @kounter = 0
  def initialize(str)
    @str = str
  end
  def scan(arg)
    res = @str.scan(arg)
    return nil unless @kounter<res.length
    @kounter=@kounter+1
    res[@kounter-1]
  end
end

str = "Watch how I soar!"
ss = StringScanner.new(str)
loop do
  word = ss.scan(/\w+/)    # Grab a word at a time
  break if word.nil?
  puts word
  sep = ss.scan(/\W+/)     # Grab next non-word piece
  break if sep.nil?
end

And this is the result:
C:/Documents and Settings/Roby/Desktop/Apps/Ruby/prova2.rb:9:in `scan':
undefined method `<' for nil:NilClass (NoMethodError)
        from C:/Documents and
Settings/Roby/Desktop/Apps/Ruby/prova2.rb:18
        from C:/Documents and
Settings/Roby/Desktop/Apps/Ruby/prova2.rb:17:in `loop'
        from C:/Documents and
Settings/Roby/Desktop/Apps/Ruby/prova2.rb:17

Help.
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