What is Math.floor() method and it’s Usage in JavaScript?
Having a hard time rounding down a number? Well, it can be easier using the Math.floor method in JavaScript. In this article, we will explore the Math.floor() method in JS, …
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 ↓
Sha1 in JavaScript with Methods and Example Codes
Welcome to the complete guide on using Sha1 in JavaScript with methods and example codes. SHA-1 (Secure Hash Algorithm 1) is a widely-used cryptographic hash function that plays an important …
How to Math round down in JavaScript? Round Down a Number
In today’s tutorial, you’ll discover the best ways to Math round down a number in JavaScript. We will hand you the different solutions how to round down a number in …
Atomic JavaScript with Example Codes and Methods
In this post, we will explore the ins and outs of atomic JavaScript, including example codes and methods that can enhance your web development projects. This article will provide valuable …
JavaScript Dot Notation vs. Bracket Notation | Properties Accessor
In this article, we embark on a journey to explore the depths of JavaScript Dot Notation vs. Bracket Notation, demystifying their usage, advantages, and potential pitfalls. What is JavaScript Dot …
What is Javascript E? How To Use It?
In this article, we’ll dive deep into the realm of ‘e’ in JavaScript, exploring how it represents events and unlocks a world of possibilities for interactive web development. Whether you’re …
JavaScript Exclamation Mark After Variable | How To Use It
JavaScript Exclamation Mark after a variable is a straightforward concept but it seems cryptic term in the programming world. This article aims to simplify it for you whether you are …
Convert JavaScript to Typescript Online
In this post, we’ll explore how to convert JavaScript to TypeScript online, step by step. Whether you are a proficient developer or just starting, we’ve got you covered. One of …
JavaScript Console Log Array with Example Codes
In this post, we will discuss the topic JavaScript Console Log Array, explore its different methods, and provide real examples that will help you use its full potential. Before we …
How to Start and Stop a setInterval Call in JavaScript?
If you are wondering how to start and stop a setInterval call in JavaScript? Read on to explore new insights! In this article, we will show you how to use …
JavaScript Convert Map to Array with Example Codes
In this post, you are going learn the different techniques for converting JavaScript maps to arrays with example codes. Among these, maps are especially useful for storing key-value pairs. However, …
What is Underscore.js or Underscore in JavaScript?
Do you want to know the power of underscore.js or underscore in JavaScript? Read on! In this article, we will learn about underscore.js, a JavaScript library that provides a collection …
How to Remove a Part of String in JavaScript?
Are you ready to discover and explore the solutions on how to remove a part of the string in JavaScript? In this article, we will hand you several solutions that …
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.