JavaScript built-in functions: A cheat sheet for Beginners
In this article, you will be able to discover the cheat sheet for JavaScript built-in functions along with its definitions and examples. We will show you everything you need to …
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 ↓
How to typecast in JavaScript
Welcome on typecasting in JavaScript! In this article, you will learn the data type conversions and how they can be effectively used in JavaScript programming. Understanding typecasting is an important …
JavaScript CallStack: How it Works and Why it Matters?
In this article, we will explore the JavaScript callstack and how it works to run your code, and why it matters. Let us discover how it affects your application’s performance and …
String Truncate JavaScript: Techniques and Best Practices
In this article, you learn the concept of truncate string JavaScript, exploring different techniques and best practices to accomplish this effectively. In JavaScript language, working with strings is a simple …
JavaScript Generate UUID with Examples
Are you looking to generate a unique identifier for your JavaScript application? You’ve come to the right place! In this article, we will discuss how to generate a UUID (Universally …
JavaScript Math ceil() method: Everything you need to know
Discover the incredible power of rounding up with our detailed guide on using the Math.ceil() method in JavaScript. Our comprehensive tutorial covers everything you need to become a master of …
How to change a class property of DOM element in JavaScript?
Are you wondering how to change the CSS class property of a DOM element in JavaScript? Look no further! Our comprehensive tutorial will guide you through the whole process of selecting …
How to Reload the Page in JavaScript
Reloading a page constantly using JavaScript is a simple task for web developers. Whether you want to refresh content, update data, or trigger specific actions, JavaScript offers multiple methods to …
How to change text color in JavaScript dynamically?
In this article, we will show you how to change text color with JavaScript dynamically. Our comprehensive, step-by-step tutorial guides you through the process of using the DOM style property to …
How to check if a file exists in JavaScript?
In this article, you can learn how to check if a file exists in JavaScript, so make sure not to miss out on it! Keep reading as we will cover different …
How to check if a number is NaN or Infinity in JavaScript?
Explore how to check for NaN and Infinity values in JavaScript with our easy-to-understand guide. Don’t miss out on this valuable information, so keep reading to learn more! In this article, you’ll …
How to check if array is empty or not in JavaScript? 6 Methods
In this article, we will delve into how to check if a JavaScript array is empty or not with our in-depth guide. We have covered six (6) different methods for …
The Difference Between JavaScript Let vs Var vs Const
In JavaScript, you have the choice to declare variables using the keywords var, let, and const. However, what is the difference between JavaScript Let vs Var vs Const? That 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.