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private jsp web hosting private jsp web hosting Instances of Shape are created by giving the constructor the required number of sides and the total perimeter. class Shape def initialize(numSides, perimeter) # ... 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.

private jsp web hosting Simply add some class methods to Shape. class Shape def Shape.triangle(sideLength) Shape.new(3, sideLength*3) end def Shape.square(sideLength) Shape.

private jsp web hosting 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. 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.

private jsp web hosting 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. Methods are public by default (except for initialize, which is always private). Protected methods can be invoked only by objects of the defining class and its subclasses.

private jsp web hosting

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