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inexpensive web hosting inexpensive web hosting Ruby offers an interesting and powerful compromise, giving you the simplicity of single inheritance and the power of multiple inheritance. A Ruby class can have only one direct parent, and so Ruby is a single-inheritance language. However, Ruby classes can include the functionality of any number of mixins (a mixin is like a partial class definition). This provides a controlled multiple-inheritance-like capability with none of the drawbacks. We'll explore mixins more beginning on page 98.

inexpensive web hosting 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. In general, this is a Good Thing.

inexpensive web hosting 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. 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).

inexpensive web hosting 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.duration » 260 Here we've defined three accessor methods to return the values of the three instance attributes.

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