JavaScript Basics

What is JavaScript?

JavaScript adds interactivity and behavior to web pages.

Key Concepts

Variables


const name = 'Google';    // cannot be reassigned
let count = 0;            // can be reassigned

DOM Manipulation


// Select an element
const button = document.querySelector('.search-btn');
 
// Add an event listener
button.addEventListener('click', () => {
  console.log('Button clicked!');
});

My Notes

Last updated on March 22, 2026