(Addition Assignment) - MACROMEDIA FLASH MX 2004-ACTIONSCRIPT LANGUAGE Reference

+= (addition assignment)

Availability
Flash Player 4.
Usage
expression1 += expression2
Parameters
expression1,expression2
Returns
A string or a number.
Description
Operator (arithmetic compound assignment); assigns
. For example, the following two statements have the same result:
expression2
x += y;
x = x + y;
This operator also performs string concatenation. All the rules of the addition (+) operator apply
to the addition assignment
For more information, see "Operator precedence and associativity" in Using ActionScript in Flash.
Example
Usage 1: This example uses the
Gilbert" to the Output panel.
var x1:String = "My name is ";
x1 += "Gilbert";
trace(x1); // output: My name is Gilbert
Usage 2: The following example shows a numeric use of the addition assignment (
var x:Number = 5;
var y:Number = 10;
x += y;
trace(x); // output: 15
See also
+ (addition)
72 Chapter 2: ActionScript Language Reference
A number or string.
operator.
(+=)
operator with a string expression and sends "My name is
+=
the value of
expression1 expression1 +
operator:
+=)