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cheap private java database cheap private java database Hashes Hashes (sometimes known as associative arrays or dictionaries) are similar to arrays, in that they are indexed collectives of object references. However, while you index arrays with integers, you can index a hash with objects of any type: strings, regular expressions, and so on. When you store a value in a hash, you actually supply two objects---the key and the value. You can subsequently retrieve the value by indexing the hash with the same key. The values in a hash can be any objects of any type.

cheap private java database 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. You'll find that hashes are one of the most commonly used data structures in Ruby.

cheap private java database 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. append( aSong ) » list Append the given song to the list.

cheap private java database 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. 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.

cheap private java database

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cheap private java database