User Guide

154 ActionScript language elements

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,

z++, is evaluated and z is incremented by

one.

var v:Number = 0;

var z:Number = 0;

v = v + 4 , z++, v + 6;

trace(v); // output: 4

trace(z); // output: 1

The following example is identical to the previous example except for the addition of the

parentheses () operator and illustrates once again that, when used with the parentheses ()

operator, the comma (,) operator returns the value of the last expression in the series:

var v:Number = 0;

var z:Number = 0;

v = (v + 4, z++, v + 6);

trace(v); // output: 6

trace(z); // output: 1