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autoresponders autoresponders triangle(sideLength)     Shape.new(3, sideLength*3)   end   def Shape.square(sideLength)     Shape.new(4, sideLength*4)   end end There are many interesting and powerful uses of class methods, but exploring them won't get our jukebox finished any sooner, so let's move on. When designing a class interface, it's important to consider just how much access to your class you'll be exposing to the outside world.

autoresponders Allow too much access into your class, and you risk increasing the coupling in your application---users of your class will be tempted to rely on details of your class's implementation, rather than on its logical interface. The good news is that the only way to change an object's state in Ruby is by calling one of its methods. Control access to the methods and you've controlled access to the object. A good rule of thumb is never to expose methods that could leave an object in an invalid state. Ruby gives us three levels of protection.

autoresponders can be called by anyone---there is no access control. Methods are public by default (except for , which is always private). can be invoked only by objects of the defining class and its subclasses. Access is kept within the family. cannot be called with an explicit receiver.

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