From: Eero Saynatkari <eero.saynatkari@...>
Date: 2006-09-13T12:39:20+09:00
Subject: Re: Newbie Alert

John Legate wrote:
> 01	class Song
> 02	  def initialize(name, artist, duration)
> 03	    @name     = name
> 04	    @artist   = artist
> 05	    @duration = duration
> 06	  end
> 07	  def to_s
> 08	    puts "Song: #{@name}--#{@artist} (#{@duration})"

Here is your problem. #puts prints out the String but it
returns nil.

> 09	  end
> 10	end
> 11
> 12	aSong = Song.new("My Way", "Sinatra", 225)
> 13	print "aSong.to_s ==> "
> 14	aSong.to_s
> 15
> 16	class KaraokeSong < Song
> 17	  def initialize(name, artist, duration, lyrics)
> 18	    super(name, artist, duration)
> 19	    @lyrics = lyrics
> 20	  end
> 21	  def to_s
> 22	    super + " [#{@lyrics}]"

So here you have printed it out but have gotten a
nil back, whence your error since nil does not
respond to #+.

> 23	  end
> 24	end
> 25
> 26	kSong = KaraokeSong.new("My Way", "Sinatra", 225, "And now, the...")
> 27	print "kSong.to_s ==> "
> 28	kSong.to_s

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