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private jsp website hosting private jsp website hosting 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. 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.

private jsp website hosting class SongList def [](key) if key.kind_of?(Integer) return @songs[key] else for i in 0...@songs.

private jsp website hosting length return @songs[i] if key == @songs[i].name end end return nil end end This works, and it looks comfortingly familiar: a for loop iterating over an array. What could be more natural? It turns out there is something more natural. In a way, our for loop is somewhat too intimate with the array; it asks for a length, then retrieves values in turn until it finds a match. Why not just ask the array to apply a test to each of its members? That's just what the find method in Array does.

private jsp website hosting class SongList def [](key) if key.kind_of?(Integer) result = @songs[key] else result = @songs.find { |aSong| key == aSong.name } end return result end end We could use if as a statement modifier to shorten the code even more. class SongList def [](key) return @songs[key] if key.

private jsp website hosting

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