9.2.1 Prototypes

Every object has a prototype object that is used to match references at runtime. This prototype is called the delegate of the object. Delegation is a simple way to add shared properties to a group of related objects at runtime.

Prototype objects are always instances of the dynamic class Object and therefore can always be extended by the addition of dynamic properties. Unlike with function closures that have a prototype property that is a variable and can be reset to another object, classes have a prototype that is read-only and so always point to the same object.

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