9 Classes

A class is a type, a constructor of objects of that type, and a singleton object for sharing state and behavior. It is used as a constructor to create like instances. It is used as a type to constrain the value of properties. It is used as a singleton object to contain shared properties.

Classes are introduced with class definitions. A class definition can directly extend one other class definition and implement multiple interface definitions. The language does not support the concept of abstract classes and so a class must implement every interface method it inherits.

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