How to use Escape Characters in JavaScript?
What is an escape character in JavaScript? A backslash (\\) in JavaScript is used as an escape character. It allows us to insert special characters into a string by changing …
JavaScript Tutorial 2026 — Free ES6+ Beginner to Advanced
JavaScript is the only language that runs natively in every web browser — making it essential for any web-based BSIT capstone, modern web application, or interactive site. This hub collects free JavaScript tutorials from basic variables and functions through modern ES6+ features, DOM manipulation, async programming, and integration with REST APIs.
What you’ll learn in the JavaScript tutorial series
- Core fundamentals — variables (let/const), data types, operators, conditionals, loops
- Functions — declarations, expressions, arrow functions, closures, callbacks
- DOM manipulation — selecting elements, modifying content, event handling
- ES6+ features — destructuring, spread/rest, template literals, modules
- Async programming — Promises, async/await, fetch API, error handling
- Array methods — map, filter, reduce, find, forEach (functional programming patterns)
- Object-Oriented JavaScript — classes, prototypes, inheritance, getters/setters
- Modern tooling — npm, webpack/Vite, ESLint, Prettier
Why every BSIT student should know JavaScript
JavaScript is unavoidable in modern web development — it’s the only language browsers natively execute. Even capstones built on PHP + MySQL back-ends need JavaScript for client-side validation, AJAX form submissions, dynamic UI updates, and modern interactive features. Beyond browsers, Node.js lets you write server-side JavaScript too, opening up the entire MEAN/MERN/MEVN stack family.
JavaScript vs TypeScript — which should I learn?
Start with JavaScript first to understand the core language. Once you’re comfortable, TypeScript is a superset that adds optional static typing — it catches more bugs at compile time and is the modern standard for large React/Vue/Angular projects in 2026. Most BSIT capstones can use either; pick TypeScript if your panel values type safety and modern best practices.
Related JavaScript resources
- JavaScript Projects — 55+ downloadable JS capstones
- React Projects — JS framework for modern UIs
- Vue.js Projects — alternative front-end framework
- Node.js Projects — server-side JavaScript
- TypeScript Tutorial — add types to your JS
- AJAX Projects — async API patterns
Scroll down to browse the full JavaScript tutorial catalog ↓
Online JavaScript Compiler
Run JS code online for free to use, where you can write, run button, and share Js code. A user-friendly Javascript text editor supports standard libraries and takes users input.
How to Extract or Get Only Numbers from a String in JavaScript?
In this article, we will hand you the solutions on how to extract or get only numbers from a string in JavaScript with our easy-to-follow guide. There a multiple ways …
What is isfinite() Function in JavaScript? Examples and Usage
Are you interested in understanding the power of the isFinite() function in JavaScript? Read on to explore its usage and examples. In this article, we will demonstrate how this function …
What is JavaScript NumberFormat Comma and its Usage?
Are you ready to unfold the secret of the JavaScript NumberFormat Comma and its Usage? Read on! In this article, you’ll explore the power of JavaScript’s NumberFormat method and learn how to …
How to Convert String to Byte Array in JavaScript?
Are you excited to know how programmers convert the JavaScript string to bytes? Read on! In this article, we will hand you the easy way on to convert the string …
Understanding the Caesar Cipher in JavaScript
Do you know what the Caesar Cipher is in JavaScript? If it sounds unfamiliar, read on to discover new insights! Aside from understanding the Caesar Cipher, we will also delve …
What is JavaScript Promise.resolve() Method and its Usage?
Are you wondering what JavaScript Promise.resolve() Method is and how to use it? Keep on reading! In this article, we will discuss the Promise.resolve() method in JavaScript along with examples. …
How to Find the Largest Number in an Array in JavaScript?
Do you want to know what the largest number in JavaScript is and how to find the largest number in an array? In this article, you’ll discover the largest number …
What is the Difference between JavaScript SubString vs Slice
Do you want to know the difference between the JavaScript string Substring vs Slice methods? Read on! In this article, you will understand the distinction between the substring and slice …
How to Get Today’s Date in dd/mm/yyyy Format in JavaScript?
Do you want to know how to get the current or today’s date in the MM/DD/YYYY format in JavaScript? Keep on reading! In this article, we will present various JavaScript …
How to Compute the Average Using JavaScript’s Math Functions
How to calculate or compute the average of a number using JavaScript Math functions? In this article, we will delve into various methods that can help you calculate averages. From …
How to use Dragula in JavaScript? Drag-and-Drop Features
Have you heard about the drag-and-drop feature provided by Dragula in JavaScript? If not, and you’re curious about what it is and how to use it, then this article is …
Frequently Asked Questions
Do I need to learn JavaScript before React or Vue?
Yes — solid JavaScript fundamentals are essential before tackling frameworks. Spend at least 4-8 weeks on core JS (variables, functions, arrays, objects, DOM, async) before touching React, Vue, or Angular. Jumping straight to a framework without knowing the underlying language leads to copy-paste developers who can't debug or extend their code — panels notice this in defense. ES6+ syntax (arrow functions, destructuring, spread/rest) is mandatory before frameworks.
What's the difference between var, let, and const?
var is the old (pre-2015) way to declare variables — function-scoped, hoisted, can be redeclared. Avoid in modern code. let is block-scoped, can be reassigned, can't be redeclared in the same scope. Use for variables whose value will change. const is block-scoped, can't be reassigned. Use by default; switch to let only when reassignment is needed. Rule of thumb: const by default, let when needed, never var.
What's async/await and why does it matter?
async and await are modern JavaScript syntax for working with Promises (asynchronous operations like fetching data from an API). Old callback-based code becomes deeply nested ("callback hell"). Promises improved this. async/await makes asynchronous code read like synchronous code — much easier to follow. Essential for any modern web app that talks to a server: const response = await fetch('/api/users'); const data = await response.json();.How do I run JavaScript outside a browser?
Install Node.js (free, cross-platform from nodejs.org) — it's a JavaScript runtime that lets you execute .js files from your terminal. Use cases beyond browsers: server-side web apps (Express, Fastify, NestJS), command-line tools, build tooling (webpack, Vite), desktop apps (Electron), testing scripts (Jest, Playwright). Browse our Node.js Projects for server-side examples.
Should I learn TypeScript instead of JavaScript?
Learn JavaScript first, then add TypeScript when you're comfortable. TypeScript is JavaScript with optional static typing — it catches more bugs at compile time but adds complexity. For 2026 capstones using React/Vue/Angular, TypeScript is increasingly the standard. For pure jQuery or vanilla JS capstones, TypeScript is overkill. See our TypeScript Tutorial when you're ready.
What can I build with JavaScript for my capstone?
Browser-only capstones: games (Tic-Tac-Toe, Hangman, Memory, Flappy Bird), calculators and converters, interactive dashboards with Chart.js. Front-end + back-end (full-stack): MERN stack capstones (React + Express + MongoDB), real-time chat apps with Socket.io, e-commerce front-ends consuming a PHP back-end. Browse our JavaScript Projects for examples.