Comparison operators in Javascript

Introduction

Comparison operators help us check if things are equal, bigger, or smaller. This helps the computer decide what to do next.

Checking if a user entered the right password

Deciding if a number is bigger than another to show a message

Finding out if two values are the same before continuing

Sorting items by comparing their sizes or names

Syntax

Javascript

value1 == value2
value1 === value2
value1 != value2
value1 !== value2
value1 > value2
value1 >= value2
value1 < value2
value1 <= value2

Use === and !== for exact matches including type.

Use == and != for loose comparison (not recommended).

Examples

== checks value only, so 5 and '5' are equal. === checks value and type, so they are not equal.

Javascript

5 == '5'  // true
5 === '5' // false

Check if one number is bigger or smaller or equal to another.

Javascript

10 > 7  // true
3 <= 3  // true

Check if two strings are not exactly the same.

Javascript

'apple' !== 'orange'  // true

Sample Program

This program compares numbers and strings using different comparison operators and prints the results.

Javascript

const a = 10;
const b = '10';

console.log(a == b);   // true
console.log(a === b);  // false
console.log(a > 5);    // true
console.log(a < 5);    // false
console.log(a != b);   // false
console.log(a !== b);  // true

Important Notes

Always prefer === and !== to avoid unexpected results.

Comparison operators return true or false, which are useful in decisions.

Summary

Comparison operators check how two values relate to each other.

=== and !== check both value and type.

They help the program decide what to do next.