JavaScript: The Hard Parts
Free Advanced course · 10 lessons · 4 weeks · Certificate on completion
Understand closures, the event loop, prototypes and async deeply enough to debug anything. Across 10 lessons you'll move from fundamentals to a portfolio-ready outcome — at your own pace, with quizzes after each lesson and a final exam to certify your mastery.
What you'll learn
- Execution context
- Scope and closures
- this and binding
- Prototypes and classes
- The event loop
- Promises in depth
Skills you'll pick up
- Execution context
- Scope and closures
- this and binding
- Prototypes and classes
- The event loop
- Promises in depth
Tools covered
- Advanced JavaScript
- Real-world projects
- Quizzes
- Final exam
Course modules
Module 1: Execution context
Module 1 of JavaScript: The Hard Parts. 3 lessons · 3h
Module 2: Prototypes and classes
Module 2 of JavaScript: The Hard Parts. 3 lessons · 3h
Module 3: Async/await pitfalls
Module 3 of JavaScript: The Hard Parts. 2 lessons · 2h
Module 4: Memory and garbage collection
Module 4 of JavaScript: The Hard Parts. 2 lessons · 2h
Lessons in this course
- Execution context
- Scope and closures
- this and binding
- Prototypes and classes
- The event loop
- Promises in depth
- Async/await pitfalls
- Generators and iterators
- Memory and garbage collection
- Modules
Instructor
Kenji Watanabe — Web Performance Engineer
Kenji Watanabe is a Web Performance Engineer with years of hands-on experience teaching Advanced JavaScript to thousands of learners worldwide.
Certificate
Finish every lesson and pass the final exam to earn a free, verifiable Learnera certificate for JavaScript: The Hard Parts. It can be downloaded as a PDF and shared on LinkedIn.
Career outcomes
Median global salary $130,000 per year · median India salary ₹18,20,000 per year · 45,653 open roles worldwide
- Advanced JavaScript Specialist
- Senior Advanced JavaScript Lead
- Advanced JavaScript Consultant
Frequently asked questions
Is the JavaScript: The Hard Parts course free?
Yes. Every Learnera course, including JavaScript: The Hard Parts, is completely free — lessons, quizzes, the final exam, and the certificate.
How long does JavaScript: The Hard Parts take?
10 lessons, typically completed in 4 weeks at a comfortable pace.
Do I get a certificate?
Yes — pass the final exam and you receive a free, verifiable certificate you can share on LinkedIn.