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inexpensive web hosting business plan 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. 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.
inexpensive web hosting business plan 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. deleteFirst() » aSong Remove the first song from the list, returning that song. deleteLast() » aSong Remove the last song from the list, returning that song.
inexpensive web hosting business plan [ 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. 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.
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