User Guide

76 Chapter 2: ActionScript Language Reference

<<= (bitwise left shift and assignment)

Availability

Flash Player 5.

Usage

expression1 <<= expression2

Parameters

expression1

A number or expression to be shifted left.

expression2 A number or expression that converts to an integer from 0 to 31.

Returns

A 32-bit integer.

Description

Operator (bitwise compound assignment); this operator performs a bitwise left shift (<<=)

operation and stores the contents as a result in

expression1. The following two expressions are

equivalent:

A <<= B

A = (A << B)

For more information, see “Operator precedence and associativity” in Using ActionScript in Flash.

Example

In the following example, you use the bitwise left shift and assignment (<<=) operator to shift all

bits one space to the left:

var x:Number = 4;

// shift all bits one slot to the left.

x <<= 1;

trace(x); // output: 8

// 4 decimal = 0100 binary

// 8 decimal = 1000 binary