Flash 8 Documentation

ActionScript 2.0 Language Reference > ActionScript classes > Object > __proto__ (Object.__proto__ property)

__proto__ (Object.__proto__ property)

Refers to the prototype property of the class (ActionScript 2.0) or constructor function (ActionScript 1.0) used to create the object. The __proto__ property is automatically assigned to all objects when they are created. The ActionScript interpreter uses the __proto__ property to access the prototype property of the object's class or constructor function to find out what properties and methods the object inherits from its superclass.

Availability: ActionScript 1.0; Flash Player 5

Example

The following example creates a class named Shape and a subclass of Shape named Circle.

// Shape class defined in external file named Shape.as
class Shape {
    function Shape() {}
}

// Circle class defined in external file named Circle.as
class Circle extends Shape{
    function Circle() {}
}

The Circle class can be used to create two instances of Circle:

var oneCircle:Circle = new Circle();
var twoCircle:Circle = new Circle();

The following trace statements show that the __proto_ property of both instances refers to the prototype property of the Circle class.

trace(Circle.prototype == oneCircle.__proto__); // Output: true
trace(Circle.prototype == twoCircle.__proto__); // Output: true

See also

prototype (Object.prototype property)

Version 8