User Guide

90 ActionScript Language and Syntax

You can also iterate through the elements of an array, as this example shows:

var myArray:Array = ["one", "two", "three"];

for each (var item in myArray)

{

trace(item);

}

// output:

// one

// two

// three

You cannot iterate through the properties of an object if the object is an instance of a sealed

class. Even for instances of dynamic classes, you cannot iterate through any fixed properties,

which are properties defined as part of the class definition.

while

The while loop is like an if statement that repeats as long as the condition is true. For

example, the following code produces the same output as the

for loop example:

var i:int = 0;

while (i < 5)

{

trace(i);

i++;

}

One disadvantage of using a while loop instead of a for loop is that infinite loops are easier

to write with

while loops. The for loop example code does not compile if you omit the

expression that increments the counter variable, but the

while loop example does compile if

you omit that step. Without the expression that increments

i, the loop becomes an infinite

loop.

do..while

The do..while loop is a while loop that guarantees that the code block is executed at least

once, because the condition is checked after the code block is executed. The following code

shows a simple example of a

do..while loop that generates output even though the condition

is not met:

var i:int = 5;

{

trace(i);

i++;