MACROMEDIA FLASH MX 2004 - ACTIONSCRIPT - Page 250

250 Chapter 12: ActionScript Dictionary
Description
Operator (logical); evaluates expression1 and expression2. The result is true if either or both
expressions evaluate to
true; the result is false only if both expressions evaluate to false. You
can use the logical OR operator with any number of operands; if any operand evaluates to
true,
the result is
true.
With non-Boolean expressions, the logical OR operator causes Flash to evaluate the expression on
the left; if it can be converted to
true, the result is true. Otherwise, it evaluates the expression on
the right and the result is the value of that expression.
Example
Usage 1: The following example uses the || operator in an if statement. The second expression
evaluates to
true so the final result is true:
x = 10
y = 250
start = false
if(x > 25 || y > 200 || start){
trace('the logical OR test passed');
}
Usage 2: This example demonstrates how a non-Boolean expression can produce an unexpected
result. If the expression on the left converts to
true, that result is returned without converting the
expression on the right.
function fx1(){
trace ("fx1 called");
returns true;
}
function fx2(){
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
|= (bitwise OR assignment)
Availability
Flash Player 5.
Usage
expression1 |= expression2
Parameters
expression1,expression2
A number or variable.
Returns
None.