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create wedding web site create wedding web site 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. deleteFirst() aSong Remove the first song from the list, returning that song.

create wedding web site 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. Similarly, the ability to return a song at an integer position in the list is supported by arrays.

create wedding web site 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. 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.

create wedding web site 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. class SongList   def initialize     @songs = Array.new   end end The SongList#append method adds the given song to the end of the @songs array.

create wedding web site

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create wedding web site