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private jsp web site hosting private jsp web site hosting The values in a hash can be any objects of any type. The example that follows uses hash literals: a list of key => value pairs between braces. h = { 'dog' => 'canine', 'cat' => 'feline', 'donkey' => 'asinine' } h.length » 3 h['dog'] » "canine" h['cow'] = 'bovine' h[12] = 'dodecine' h['cat'] = 99 h » {"cow"=>"bovine", "cat"=>99, 12=>"dodecine", "donkey"=>"asinine", "dog"=>"canine"} Compared with arrays, hashes have one significant advantage: they can use any object as an index. However, they also have a significant disadvantage: their elements are not ordered, so you cannot easily use a hash as a stack or a queue.

private jsp web site hosting You'll find that hashes are one of the most commonly used data structures in Ruby. A full list of the methods implemented by class Hash starts on page 317. Implementing a SongList Container After that little diversion into arrays and hashes, we're now ready to implement the jukebox's SongList. Let's invent a basic list of methods we need in our SongList. We'll want to add to it as we go along, but it will do for now.

private jsp web site hosting append( aSong ) » list Append the given song to the list. deleteFirst() » aSong Remove the first song from the list, returning that song. deleteLast() » aSong Remove the last song from the list, returning that song. [ anIndex } » aSong Return the song identified by anIndex, which may be an integer index or a song title. This list gives us a clue to the implementation.

private jsp web site hosting The ability to append songs at the end, and remove them from both the front and end, suggests a dequeue---a double-ended queue---which we know we can implement using an Array. Similarly, the ability to return a song at an integer position in the list is supported by arrays. However, there's also the need to be able to retrieve songs by title, which might suggest using a hash, with the title as a key and the song as a value. Could we use a hash? Well, possibly, but there are problems. First a hash is unordered, so we'd probably need to use an ancillary array to keep track of the list.

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