User Guide

Operators 153
, comma operator
(expression1 , expression2 [, expressionN... ])
Evaluates expression1, then expression2, and so on. This operator is primarily used with
the
for loop statement and is often used with the parentheses () operator.
Availability: ActionScript 1.0; Flash Player 4
Operands
expression1 : Number - An expression to be evaluated.
expression2 : Number - An expression to be evaluated.
expressionN : Number - Any number of additional expressions to be evaluated.
Returns
Object - The value of expression1, expression2, and so on.
Example
The following example uses the comma (,) operator in a
for loop:
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