Not

[a] → [!a]

• Action Code: 0x12
• Stack: 1 → 1
• SWF version: 4

Adobe documentation

ActionAnd

ActionNot performs a logical NOT of a number.

Note: In SWF 5 files, the ActionNot operator converts its argument to a Boolean value, and pushes a result of type Boolean. In SWF 4 files, the argument and result are numbers.

Field	Type	Comment
ActionNot	ACTIONRECORDHEADER	ActionCode = 0x12
Result	Boolean

ActionNot does the following:

1. Pops a value off the stack.
2. Converts the value to floating point; non-numeric values evaluate to 0.
3. If the value is zero, true is pushed on the stack for SWF 5 and later (1 is pushed for SWF 4).
4. If the value is nonzero, false is pushed on the stack for SWF 5 and later (0 is pushed for SWF 4).