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website developer website developer We'll explore mixins more beginning on page 98. So far in this chapter we've been looking at classes and their methods. Now it's time to move on to the objects, such as the instances of class Song. Objects and Attributes The Song objects we've created so far have an internal state (such as the song title and artist). That state is private to those objects---no other object can access an object's instance variables.

website developer In general, this is a Good Thing. It means that the object is solely responsible for maintaining its own consistency. However, an object that is totally secretive is pretty useless---you can create it, but then you can't do anything with it. You'll normally define methods that let you access and manipulate the state of an object, allowing the outside world to interact with the object. These externally visible facets of an object are called its attributes.

website developer For our Song objects, the first thing we may need is the ability to find out the title and artist (so we can display them while the song is playing) and the duration (so we can display some kind of progress bar). class Song   def name     @name   end   def artist     @artist   end   def duration     @duration   end end aSong = Song.new("Bicylops", "Fleck", 260) aSong.artist "Fleck" aSong.name "Bicylops" aSong.

website developer duration 260 Here we've defined three accessor methods to return the values of the three instance attributes. Because this is such a common idiom, Ruby provides a convenient shortcut: attr_reader creates these accessor methods for you. class Song   attr_reader :name, :artist, :duration end aSong = Song.new("Bicylops", "Fleck", 260) aSong.artist "Fleck" aSong.

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