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inexpensive web hosting business 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 SongList class, which we can specialize into catalogs and playlists. Containers Before we start implementing, we'll need to work out how to store the list of songs inside a SongList object. We have three obvious choices.
inexpensive web hosting business We could use the Ruby Array type, use the Ruby Hash 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.Arrays The class Array 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 Array object.
inexpensive web hosting business A literal array is simply a list of objects between square brackets. a = [ 3.14159, "pie", 99 ] a.type » Array a.length » 3 a[0] » 3.
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