Extends

SWF Action
Action Category: 
Objects
Action Details: 
0
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: 
7
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.