Advanced JavaScript is a course that takes modern JavaScript further, covering closures, classes, functional techniques, the event loop, Promises and async/await, ES modules, a first look at TypeScript, testing and building a REST API with Node.js and Express 5. It suits developers who already know the basics and want to write maintainable code for real projects.
JavaScript today is not only for web pages: it also powers server-side APIs, build tools and large applications. Developers who know the basics often start to struggle as their code grows, with this not holding the value they expect, asynchronous work running in the wrong order, errors disappearing silently, or a single file so long that nobody dares to change it, even though the language already has the tools to deal with all of this.
This course takes JavaScript to the level used in real projects. Learners set up Node.js, npm and Vite, get to grips with scope, closures and this, handle data with destructuring, spread and non-mutating array methods, and write functional and object-oriented code with classes. They then dig into the event loop, Promises, async/await, generators, ES modules and modern browser APIs, before building a REST API with Node.js and Express 5, starting with TypeScript, writing tests and looking after performance and security. The course closes with a capstone web app backed by a fully tested API. (3 days, 6 hours per day, 18 hours in total, Intermediate level.)
Course Details
This course is the 2026 edition of the Advanced JavaScript course. It runs for 3 days, 6 hours per day (18 hours in total, 09:00-16:00), as lectures with labs. Intermediate level. This edition goes beyond the ES6 features of the previous edition to the latest ECMAScript, including iterator helpers, Set methods, Promise.try and using declarations. It moves from Express 4 to Express 5 and
adds Vite, an introduction to TypeScript, testing with the Node.js test runner, and performance and security topics. Every lab uses open source tools on the learner's own machine. The course focuses on the language itself and Node.js, building on Basic JavaScript and laying the groundwork for React, Vue, Angular or NestJS. Learners take home a lab guide, starter and solution code for every lab, and their capstone project.
Section 1: Lab: Setting Up a Modern JavaScript Environment
Section 2: Scope, Closures and this
Section 3: Lab: Handling Data with Modern Syntax
Section 4: Functional Programming in JavaScript
Section 5: OOP with Classes and Prototypes
Section 6: The Event Loop and Promises
Section 7: Lab: async/await and Error Handling
Section 8: Generators, Iterators and Releasing Resources
Section 9: ES Modules and Build Tools
Section 10: Lab: Modern Browser APIs
Section 11: Lab: A REST API with Node.js and Express 5
Section 12: TypeScript Basics for JavaScript Developers
Section 13: Lab: Writing Automated Tests
Section 14: Performance, Debugging and Security
Section 15: Workshop: Capstone Web App with an API
No public rounds are open right now. Join the waiting list and we will contact you first when the next round opens, or ask us on LINE. Or call 02-570-8449 or 088-807-9770
var is function-scoped, can be redeclared and is hoisted with an initial value of undefined. let and const are block-scoped and cannot be used before their declaration because of the temporal dead zone. let can be reassigned and const cannot, although the contents of an object or array held in a const can still change. When you need a copy independent of the original, use structuredClone or non-mutating array methods such as toSorted.
Wrap the await calls in try...catch so rejected promises are caught, and use finally for work that must always run, such as clearing a loading state. With Promise.all, one failure rejects the whole batch, so use Promise.allSettled when you need every result. Use AbortController to set a timeout on requests that might hang, and note that in Express 5 errors from async handlers are passed to the error middleware automatically.
JavaScript runs code on a single thread. Work that has to wait, such as timers or network calls, is handed to the browser or Node.js, and its callback is queued when it finishes. The event loop waits until the call stack is empty, then runs every queued microtask, such as promise callbacks, before taking the next macrotask, such as a setTimeout callback. Heavy calculations are therefore best moved to a Web Worker so the page does not freeze.
It suits front-end and full-stack developers, developers about to start with React, Vue, Angular or Node.js, people maintaining older JavaScript code and tech leads who review their team's code. You should be able to write basic JavaScript, including variables, conditions, loops, functions, arrays and objects, understand the DOM and events, and use the command line and Git at a basic level. Graduates of Basic JavaScript can continue straight on.
You will understand mechanisms such as closures, this, prototypes and the event loop, write code with the latest ECMAScript features, structure code in functional and object-oriented styles, handle asynchronous work with Promises and async/await, organise projects with ES modules and Vite, build a REST API with Node.js and Express 5, start using TypeScript and write automated tests. Participants who complete the training receive a Certificate of Completion with its own number, which can be verified online.
Yes. It can be run in-house for your team, with examples adapted to your own work, such as modernising the JavaScript code or APIs your team already maintains and adding tests to them. You can request a quotation from this page, or contact us on LINE @itgenius or by phone on 02-570-8449.
Articles are published in Thai.
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