<<= (Shift Left Assignment) : Bitwise Operator « Operators « JavaScript Tutorial






  1. JavaScript Tutorial
  2. Operators
  3. Bitwise Operator

The shift left operator looks at the integer stored in the variable to the left of the operator as a 32-bit binary number.

All the bits in this number are shifted to the left by the number of positions specified by the integer to the right of the operator.

As the bits are shifted to the left, zeros are filled in on the right.

The extra bits on the left are lost.

The 32-bit binary result of shifting operation is converted to an integer value and stored in the variable to the left of the operator.

<html>
    <script language="JavaScript">
    <!--
    //  3 = 00000000000000000000000000000011
    // 12 = 00000000000000000000000000001100
    x = 3;
    x <<= 2;
    document.write("x = ",x);
    -->
    </script>
</html>








2.5.Bitwise Operator
2.5.1.Bitwise Operators
2.5.2.Bitwise AND Truth Table
2.5.3.Using the Bitwise AND Operator
2.5.4.Using the Bitwise AND Plus Assignment Operator
2.5.5.Bitwise Exclusive OR Truth Table
2.5.6.Using the Bitwise Exclusive OR Operator
2.5.7.Using the Bitwise Exclusive OR Operator (2)
2.5.8.|= (Bitwise OR Assignment)
2.5.9.^= (Bitwise Exclusive OR Assignment)
2.5.10.Using Bitwise Exclusive OR Plus Assignment Operator
2.5.11.| (Bitwise OR)
2.5.12.~ (Bitwise NOT)
2.5.13.<< (Shift Left)
2.5.14.<<= (Shift Left Assignment)
2.5.15.<= (Less Than or Equal)
2.5.16.>> (Shift Right with Sign)
2.5.17.>>= (Shift Right with Sign Assignment)
2.5.18.>>> (Shift Right Zero Fill)
2.5.19.>>>= (Shift Right Zero Fill Assignment)