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ssl ssl deleteLast Song: title3--artist3 (3) list.deleteLast nil So far so good. Our next method is [], which accesses elements by index. If the index is a number (which we check using Object#kind_of? ), we just return the element at that position. class SongList   def [](key)     if key.

ssl kind_of?(Integer)       @songs[key]     else       # ...    end   end end Again, testing this is pretty trivial. list[0] Song: title1--artist1 (1) list[2] Song: title3--artist3 (3) list[9] nil Now we need to add the facility that lets us look up a song by title.

ssl This is going to involve scanning through the songs in the list, checking the title of each. To do this, we first need to spend a couple of pages looking at one of Ruby's neatest features: iterators.Blocks and Iterators So, our next problem with SongList is to implement the code in method [] that takes a string and searches for a song with that title. This seems straightforward: we have an array of songs, so we just go through it one element at a time, looking for a match. class SongList   def [](key)     if key.

ssl kind_of?(Integer)       return @songs[key]     else      for i in 0...@songs.length         return @songs[i] if key == @songs[i].

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