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affordable web hosting tool 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.
affordable web hosting tool 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.
affordable web hosting tool A bigger problem is that a hash does not support multiple keys with the same value. That would be a problem for our playlist, where the same song might be queued up for playing multiple times. So, for now we'll stick with an array of songs, searching it for titles when needed. If this becomes a performance bottleneck, we can always add some kind of hash-based lookup later. We'll start our class with a basic initialize method, which creates the Array we'll use to hold the songs and stores a reference to it in the instance variable @songs.
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