User Guide

! (logical NOT) 29

! (logical NOT)

Availability

Flash Player 4.

Usage

!expression

Parameters

expression

An expression or a variable that evaluates to a Boolean value.

Returns

A Boolean value.

Description

Operator (logical); inverts the Boolean value of a variable or expression. If expression is a

variable with the absolute or converted value

true, the value of !expression is false. If the

expression

x && y evaluates to false, the expression !(x && y) evaluates to true.

The following expressions illustrate the result of using the logical NOT (!) operator:

!true returns false

!false

returns true

For more information, see “Operator precedence and associativity” in Using ActionScript in Flash.

Example

In the following example, the variable happy is set to false. The if condition evaluates the

condition

!happy, and if the condition is true, the trace() statement sends a string to the

Output panel.

var happy:Boolean = false;

if (!happy) {

trace("don’t worry, be happy");//traces don’t worry, be happy

}

The statement traces because !false equals true.