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inexpensive web hosting and free domain registration . end end However, a couple of years later, this class is used in a different application, where the programmers are used to creating shapes by name, and by specifying the length of the side, not the perimeter. Simply add some class methods to Shape. class Shape def Shape.triangle(sideLength) Shape.
inexpensive web hosting and free domain registration 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. Access Control 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. 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.
inexpensive web hosting and free domain registration 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. Public methods can be called by anyone---there is no access control.
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