magz / music Goto Github PK

App works as described in instructions.

It can be started with

./music

and tests can be run using `rspec`


The query methods inside of library.rb are relatively inefficient and would run into problems in the event that there were a large number of tracks.  In a normal app, the database layer could be leveraged in order to handle a large number of trakcks (particularly with indices).  I did, however, implement composable query methods, which would be helpful for further development, including while implementing such a DB system.

If I wanted to implement a more robust track storage system in memory, I would use a set of hashes to store that data (though this would make bookkeeping more complciated).  Something like:

class Library
  def initialize
    @tracks_by_title = {}
    @tracks_by_artist = Hash.new { |h,k| h[k] = [] }
  end

  def add_track(artist, title)
    track = Track.new(artist, title)
    @tracks_by_title[title] = track
    @tracks_by_artist[artist] << track
  end

  def find_track_by_title(title)
    @tracks_by_title[title]
  end

  def find_tracks_by_artist(artist)
    @tracks_by_artist[artist]
  end
end