+= addition assignment operator

expression1 += expression2

Assigns expression1 the value of expression1+ expression2. For example, the following two statements have the same result:

x += y; 
x = x + y;

This operator also performs string concatenation. All the rules of the addition (+) operator apply to the addition assignment (+=) operator.

Availability: ActionScript 1.0; Flash Player 4

expression1 : Number - A number or string.

expression2 : Number - A number or string.

Number - The result of the addition.

Usage 1: This example uses the+= operator with a string expression and sends "My name is 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 (+=) operator:

var x:Number = 5; 
var y:Number = 10; 
x += y; 
trace(x); // output: 15