Javascript - Operator Bitwise AND

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Introduction

The bitwise AND operator is & and works on two values.

Bitwise AND uses the following truth table to perform an AND operation.

Bit From First Number Bit From Second NumberResult
1 1 1
1 0 0
0 1 0
0 0 0

The result will be 1 only if both bits are 1. If either bit is 0, then the result is 0.

The following example uses AND on the numbers 25 and 3: 

var result = 25 & 3; 
console.log(result);       //1

Here is how it worked. 

 25 = 0000 0000 0000 0000 0000 0000 0001 1001 
  3 = 0000 0000 0000 0000 0000 0000 0000 0011 
--------------------------------------------- 
AND = 0000 0000 0000 0000 0000 0000 0000 0001

Every other bit of the resulting number is set to 0, making the result equal to 1.

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