JavaScript Bitwise AND(&) operator is used to compare two operands by performing an AND operation on the individual bits and returning 1 only if both the bits are one. The AND(&) Operator has a lot of real-world applications and the most famous one is to check whether a number is even or odd. The operation is represented by the “&” symbol
Let’s look at the truth table below to better understand the output of the AND operation between two bits.
| A | B | OUTPUT ( A & B ) |
|---|---|---|
| 0 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
Syntax:
a & b
Example 1: In this example, we will understand the basics of AND operation
Javascript
let a = 5; let b = 3; console.log(a&b); |
Output: 5 is represented as 101 and 3 is represented as 011. When the AND operation is performed 001 is returned which after conversion to decimal returns 1 only.
1
Example 2: In this example, we will use the Bitwise AND Operation to check if a number is odd or even.
Javascript
function checkOddOrEven(n) { if(n&1 == 1) { return "Number is odd"; } return "Number is even"; } console.log(checkOddOrEven(123)); console.log(checkOddOrEven(246)); |
Output: Odd numbers have 1 as the least significant bit whereas even numbers have 0 as the least significant bit so when AND operation is performed with 1, Odd numbers return 1 whereas even numbers return 0.
Number is odd Number is even
Supported Browsers:
- Chrome
- Edge
- Firefox
- Opera
- Safari
We have a complete list of JavaScript Bitwise Operators, to check those please go through, the JavaScript Bitwise Operators article
