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A property is an undeclared variable that can be written to and accessed if the class supports properties. The classes supporting properties are Object, the application objects and the classes provided by the object and wrapper factories.
var obj = new Object object.myProperty = 100;
The class Object does not define the variable myProperty, but since the class supports properties, we can define the variable with that name on the fly and use it later. Properties are associated with the object they are assigned to, so even though the object obj in the example above gets the property myProperty, it does not mean that other objects of type Object will have the myProperty property, unless explicitly stated.
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