Extends

SWF Action

Action Category:

Objects

Action Details:

Action Identifier:

105

Action Structure:

<n.a.>

Action Length:

0 byte(s)

Action Stack:

pop 2 (s), push 1 (o)

Action Operation:

s₁ := pop();
s₂ := pop();
super_class := s₁;
sub_class := s₂;
sub_class.prototype := new object;
sub_class.prototype.__proto__ := super_class.prototype;
sub_class.prototype.__constructor__ := super_class;
push(sub_class.prototype);

Action Flash Version:

See Also:

Cast Object

Declare Object

Delete

Delete All

Implements

Instance Of

New

New Method

Type Of

The Extends action will be used to define a new object extending another object. The declaration in ActionScript is:

class A extends B;

In an SWF action script, you don't exactly declare objects, you actually instantiate them and define their functions. This action creates a new object named s₂ which is an extension of the object s₁.

Use this action whenever you need to inherit an object without calling its constructor.

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Extends

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