Take your JavaScript expertise further with this focused two-day course. Designed to help you create powerful, structured apps using current language standards and development tools. Gain skills you can immediately apply at work.
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Intermediate JavaScript
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Course overview
Advance with structured JavaScript and real-world coding practice
Master intermediate-level JavaScript in just two days. You'll refine your coding techniques with modern syntax and patterns, boost performance, and gain tools to handle asynchronous operations and scalable application design.
Learning objectives
- Apply contemporary syntax and operators
- Understand scope, closures and the scope chain
- Use object-oriented coding patterns
- Adopt functional approaches for clean code
- Control async operations effectively
- Develop structured, modular applications
- Implement practical JavaScript testing
What you'll learn
Enhance your JavaScript capability through hands-on exercises that go beyond the basics. Learn to develop scalable, testable applications using modern coding practices. Discover how to build a managed app that exploits modules and tooling alongside learning how to code tests to verify behaviour.
Asynchronous programming
Uncover the mechanics of asynchronous JavaScript by examining the event loop, async callbacks, Promises and async/await. You’ll also look at real-world use cases such as fetching remote data and scheduling timed events. With this knowledge, you’ll be able to build responsive, non-blocking applications that scale to handle complex workflows.
Modules and managed apps
Understand the fundamentals of modules and their role in modern development. Learn to export, import and organise code across applications while working with bundlers, package managers and transpilers. This module also introduces TypeScript and tooling workflows, showing how to build modular, production-ready apps that follow best practices.
Testing JavaScript code
Learn the purpose and benefits of testing by exploring unit, integration and end-to-end tests. Get hands-on with tools and techniques for testing asynchronous code and using mocks effectively. This section equips you to write reliable tests that safeguard code quality and improve long-term application stability.
Advanced JavaScript patterns
Bring together object-oriented, functional and asynchronous techniques to tackle real-world challenges. You’ll explore design choices such as immutability versus mutability, closures versus classes, and synchronous versus asynchronous handling. By integrating these patterns, you’ll leave with a broader toolkit for solving problems efficiently and writing production-ready JavaScript.
What’s included
- Live virtual training across two days
- Hands-on practical exercises
- Access to expert ILX trainers
- Course workbook and digital materials
- Supportive feedback and guidance
- Interactive problem-solving
- Certificate of completion from ILX
Key facts
Ideal for
Anyone confident with the JavaScript basics, ready to deepen their knowledge and grow their front-end or full-stack expertise.
Prerequisites
Experience in writing scripts with JavaScript fundamentals, plus familiarity with HTML and CSS for web environments will be important.
Learning experience
Our experienced trainers and interactive labs create a focused, practical environment – so you can put theory into practice from day one.
FAQs
This course equips you with practical, intermediate-level JavaScript skills, including modern syntax, object-oriented design, async handling, and robust testing for scalable app development.
How does the course approach object-oriented and functional programming?
You’ll explore both programming paradigms, learning when and how to apply them. OOP techniques such as classes and inheritance improve reusability and structure, while functional tools like pure functions, immutability, and higher-order functions make code more predictable and testable — a combination used in modern enterprise applications.
Will I learn how to handle asynchronous processes effectively?
Yes. The course covers JavaScript’s event loop, callbacks, Promises, and async/await. You’ll practise writing asynchronous code for scenarios such as API requests, scheduled tasks, and real-time operations, helping you create responsive, high-performance applications that can manage concurrent processes smoothly.
How does testing fit into the course?
Testing is essential for delivering stable applications. You’ll learn unit, integration and end-to-end testing methods, alongside tools for testing async code and using mocks. By the end, you’ll be able to build robust test suites that improve reliability and reduce the risk of regressions.
I’ve been away from JavaScript for a while. Will this course help?
Yes, it offers a great refresher on modern JavaScript techniques, helping you get back on track quickly.
Is previous training required?
Previous exposure to JavaScript or our foundation course is ideal. You should know how to use loops, conditions, and manipulate the DOM.
How is the course delivered?
This is a live, instructor-led course delivered virtually by ILX’s expert trainers, with interactive coding sessions and real-time feedback.
What our customers say
“Good structure to course. Each technical aspect broken down by instructor and theory explained with practical examples, which aided understanding and provided guidance on best practice when applying in real life scenarios. Pace was good - fast enough to keep engaged, and not too overwhelming.”
Ross, Government
“John was very knowledgeable about the subject and clearly explained everything.”
Kimberley, Community Risk Reduction IT Systems - Fire
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