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cheap private java application sans { font-family: sans-serif } Web Hosting Tips for Webmasters - Ruby Containers, Blocks, and Iterators A jukebox with one song is unlikely to be popular (except perhaps in some very, very scary bars), so pretty soon we'll have to start thinking about producing a catalog of available songs and a playlist of songs waiting to be played. Both of these are containers: objects that hold references to one or more other objects. 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.
cheap private java application 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. 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.
cheap private java application 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. A literal array is simply a list of objects between square brackets. a = [ 3.14159, "pie", 99 ] a.
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