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backup backup Both the catalog and the playlist need a similar set of methods: add a song, remove a song, return a list of songs, and so on. The playlist may perform additional tasks, such as inserting advertising every so often or keeping track of cumulative play time, but we'll worry about these things later. In the meantime, it seems like a good idea to develop some kind of generic class, which we can specialize into catalogs and playlists. Before we start implementing, we'll need to work out how to store the list of songs inside a object. We have three obvious choices.

backup We could use the Ruby type, or create our own list structure. Being lazy, for now we'll look at arrays and hashes, and choose one of these for our class. The class holds a collection of object references. Each object reference occupies a position in the array, identified by a non-negative integer index. You can create arrays using literals or by explicitly creating an object.

backup A literal array is simply a list of objects between square brackets. Arrays are indexed using the operator. As with most Ruby operators, this is actually a method (in class ) and hence can be overridden in subclasses. As the example shows, array indices start at zero. Index an array with a single integer, and it returns the object at that position or returns if nothing's there.

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