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Advanced JavaScript in 21 days

Go deep: design patterns, performance, testing, and how the JS engine works under the hood.

  • Daily plan, 45-60 min a day
  • 7 lessons + 21 exercises
  • AI tutor included
duration21-day sprint
Topics7 total
Exercises21 total
levelAdvanced
  • No prior coding experience required
  • Practice tasks every day
  • Build impressive portfolio project

What you will learn

A powered by mentors Advanced plan with structured subtopics, quizzes, and practice tasks.

01Challenge

JavaScript engine internals

Understand V8's JIT compilation, garbage collection, and hidden classes.

02Challenge

Performance: lazy loading, web workers, and WASM

Offload CPU work to workers, lazy-load assets, and integrate WebAssembly.

03Challenge

Design patterns in JavaScript

Implement Observer, Factory, Module, and other patterns idiomatically.

04Challenge

Testing with Vitest and Testing Library

Write unit, integration, and snapshot tests with modern tooling.

05Challenge

Proxies, Reflect, and metaprogramming

Use Proxy and Reflect to build reactive systems and intercept operations.

06Challenge

Micro-frontend architecture

Split large frontends into independently deployable micro-apps.

07Challenge

Capstone: plugin-based architecture

Build an extensible application using advanced patterns and testing.

See the quiz + practice flow

Three answered questions and a filled code task so you know exactly what to expect.

Quiz preview

2/3 correct

1. How long is the JavaScript plan?

Correct
21-day sprint
5-day sprint
7-day sprint
10-day sprint

2. What level is this JavaScript plan?

Incorrect
Beginner
Intermediate
Advanced
Expert

3. Which of these appears in the JavaScript outline?

Correct
JavaScript engine internals
JavaScript workflow playbook
JavaScript best-practice checklist
JavaScript case study

Code practice preview

Submitted

Format a lesson title

Build a helper that formats a lesson label with a padded index and title.

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