# Logical Operators

JavaScript supports the following logical operators −

Assume variable A holds 10 and variable B holds 20, then −

Sr.NoOperator and Description
1&& (Logical AND)

If both the operands are non-zero, then the condition becomes true.

Ex: (A && B) is true.

2|| (Logical OR)

If any of the two operands are non-zero, then the condition becomes true.

Ex: (A || B) is true.

3! (Logical NOT)

Reverses the logical state of its operand. If a condition is true, then the Logical NOT operator will make it false.

Ex: ! (A && B) is false.

### Example

Try the following code to learn how to implement Logical Operators in JavaScript.

```<html>
<body>

<script type="text/javascript">
<!--
var a = true;
var b = false;
var linebreak = "<br />";

document.write("(a && b) => ");
result = (a && b);
document.write(result);
document.write(linebreak);

document.write("(a || b) => ");
result = (a || b);
document.write(result);
document.write(linebreak);

document.write("!(a && b) => ");
result = (!(a && b));
document.write(result);
document.write(linebreak);
//-->
</script>

<p>Set the variables to different values and different operators and then try...</p>
</body>
</html>```

### Output

```(a && b) => false
(a || b) => true
!(a && b) => true
Set the variables to different values and different operators and then try...
```

### Bitwise Operators

JavaScript supports the following bitwise operators −

Assume variable A holds 2 and variable B holds 3, then −

Sr.NoOperator and Description
1& (Bitwise AND)

It performs a Boolean AND operation on each bit of its integer arguments.

Ex: (A & B) is 2.

2| (BitWise OR)

It performs a Boolean OR operation on each bit of its integer arguments.

Ex: (A | B) is 3.

3^ (Bitwise XOR)

It performs a Boolean exclusive OR operation on each bit of its integer arguments. Exclusive OR means that either operand one is true or operand two is true, but not both.

Ex: (A ^ B) is 1.

4~ (Bitwise Not)

It is a unary operator and operates by reversing all the bits in the operand.

Ex: (~B) is -4.

5<< (Left Shift)

It moves all the bits in its first operand to the left by the number of places specified in the second operand. New bits are filled with zeros. Shifting a value left by one position is equivalent to multiplying it by 2, shifting two positions is equivalent to multiplying by 4, and so on.

Ex: (A << 1) is 4.

6>> (Right Shift)

Binary Right Shift Operator. The left operand’s value is moved right by the number of bits specified by the right operand.

Ex: (A >> 1) is 1.

7>>> (Right shift with Zero)

This operator is just like the >> operator, except that the bits shifted in on the left are always zero.

Ex: (A >>> 1) is 1.

### Example

Try the following code to implement Bitwise operator in JavaScript.

```<html>
<body>

<script type="text/javascript">
<!--
var a = 2; // Bit presentation 10
var b = 3; // Bit presentation 11
var linebreak = "<br />";

document.write("(a & b) => ");
result = (a & b);
document.write(result);
document.write(linebreak);

document.write("(a | b) => ");
result = (a | b);
document.write(result);
document.write(linebreak);

document.write("(a ^ b) => ");
result = (a ^ b);
document.write(result);
document.write(linebreak);

document.write("(~b) => ");
result = (~b);
document.write(result);
document.write(linebreak);

document.write("(a << b) => ");
result = (a << b);
document.write(result);
document.write(linebreak);

document.write("(a >> b) => ");
result = (a >> b);
document.write(result);
document.write(linebreak);
//-->
</script>

<p>Set the variables to different values and different operators and then try...</p>
</body>
</html>```
```(a & b) => 2
(a | b) => 3
(a ^ b) => 1
(~b) => -4
(a << b) => 16
(a >> b) => 0
Set the variables to different values and different operators and then try...
```