User Guide

176 ActionScript language elements

Example

The following example uses the logical OR (

||) operator in an if statement. The second

expression evaluates to

true, so the final result is true:

var x:Number = 10;

var y:Number = 250;

var start:Boolean = false;

if ((x > 25) || (y > 200) || (start)) {

trace("the logical OR test passed"); // output: the logical OR test passed

}

The message the logical OR test passed appears because one of the conditions in the if

statement is true (

y>200). Although the other two expressions evaluate to false, as long as

one condition evaluates to

true, the if block executes.

The following example demonstrates how using a function call as

expression2 can lead to

unexpected results. If the expression on the left of the operator evaluates to

true, that result is

returned without evaluating the expression on the right (the function

fx2() is not called).

function fx1():Boolean {

trace("fx1 called");

return true;

}

function fx2():Boolean {

trace("fx2 called");

return true;

}

if (fx1() || fx2()) {

trace("IF statement entered");

}

The following is sent to the Output panel: fx1 called IF statement entered