(Comma) - MACROMEDIA FLASH MX 2004-ACTIONSCRIPT LANGUAGE Reference

, (comma)

Availability
Flash Player 4.
Usage
(expression1, expression2 [, expressionN...])
Parameters
None.
Returns
The value of
expression1
Description
Operator; evaluates
with the loop statement and is often used with the parentheses () operator.
for
For more information, see "Operator precedence and associativity" in Using ActionScript in Flash.
Example
The following example uses the comma (,) operator in a
for (i = 0, j = 0; i < 3 && j < 3; i++, j+=2) {
trace("i = " + i + ", j = " + j);
}
// Output:
// i = 0, j = 0
// i = 1, j = 2
The following example uses the comma (,) operator without the parentheses () operator and
illustrates that the comma operator returns only the value of the first expression without the
parentheses () operator:
var v:Number = 0;
v = 4, 5, 6;
trace(v); // output: 4
The following example uses the comma (,) operator with the parentheses () operator and
illustrates that the comma operator returns the value of the last expression when used with the
parentheses () operator:
var v:Number = 0;
v = (4, 5, 6);
trace(v); // output: 6
The following example uses the comma (,) operator without the parentheses () operator and
illustrates that the comma operator sequentially evaluates all of the expressions but returns the
value of the first expression. The second expression,
one.
var v:Number = 0;
var z:Number = 0;
46 Chapter 2: ActionScript Language Reference
,
expression2
, then
expression1 expression2
, and so on.
, and so on. This operator is primarily used
loop:
for
, is evaluated and
z++
is incremented by
z