Decrement

• Action Code: 0x51
• Stack: 1 → 1
• SWF version: 5

Abstract AS2

@push(@pop() - 1);

Adobe documentation

ActionDecrement

ActionDecrement pops a value from the stack, converts it to number type, decrements it by 1, and pushes it back to the stack.

Field	Type	Comment
ActionDecrement	ACTIONRECORDHEADER	ActionCode = 0x51

ActionDecrement does the following:

1. Pops the number off of the stack.
2. Pushes the result on to the stack.