Learn modern JavaScript - syntax, functions, arrays, objects, DOM manipulation, events, async code, and ES6+ features.
What is JavaScript and Running It JavaScript is the programming language of the web. It runs in every browser, enabling interactive pages, dynamic content, and complex ...
Variables and Data Types Variables store data. JavaScript has three ways to declare variables: let , const , and the legacy var . Understanding data types is fundamental to ...
Operators and Control Flow Operators perform actions on values. Control flow determines which code runs based on conditions and loops. These are the building blocks of any ...
Functions and Arrow Functions Functions are the core building blocks of JavaScript. They package reusable logic, accept inputs, and return outputs. ES6 added arrow functions with ...
Arrays and Objects Arrays and objects are the two most important data structures in JavaScript. Master them and you can model almost any real-world data. Arrays Iterating Arrays ...
The Document Object Model The DOM (Document Object Model) is the browser's in-memory representation of your HTML page. JavaScript uses the DOM to read, modify, and create page ...
Events and Event Handling Events are how browsers tell your JavaScript that something happened - a click, a key press, a form submit, a page load. Event handling makes pages ...
ES6+ Features ECMAScript 2015 (ES6) transformed JavaScript with major new features. Later versions added more. These features make modern JavaScript cleaner, safer, and more ...
Promises and Async/Await JavaScript runs code in a single thread but handles slow operations - network requests, file reads, timers - asynchronously. Promises and async/await ...
Fetching Data from APIs The fetch API is the modern way to make HTTP requests in JavaScript. It builds on promises, so it pairs perfectly with async/await . This post shows the ...