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JavaScript Master

Learn modern JavaScript by writing and running real code — no fake output, no simulation.

📚 58 lessons 🧩 10 phases ▶ Runs real JavaScript code
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A hands-on JavaScript course. Every example and exercise runs for real in a sandboxed Web Worker right in your browser — the same engine your code will run in on the web. Read a short idea, see it as a diagram, run it, and prove it with an exercise the browser actually executes.

Module 1 · Foundations & First Steps

Install the runtime, write your first lines, and master the core building blocks of JavaScript values, variables, functions, control flow, strings, arrays, and objects.

  1. Why JavaScript — and Why Run It for Real 18 min
  2. Values, Variables & Template Literals 19 min
  3. Functions & Arrow Functions 18 min
  4. Conditionals & Loops 22 min
  5. Strings & Their Methods 19 min
  6. Arrays & Common Methods 14 min
  7. Objects — Grouping Related Data 18 min

Module 2 · Data Types & Control Flow Deep Dive

Solidify your understanding of types, coercion, comparisons, truthiness, iteration patterns, and essential array transformations.

  1. Numbers, Math & Precision 18 min
  2. Type Coercion & Explicit Conversion 18 min
  3. Equality vs. Strict Equality 18 min
  4. Truthy, Falsy & Logical Operators 18 min
  5. Loop Patterns & Iteration 18 min
  6. Array Methods: map, filter & reduce 21 min

Module 3 · Functions & Scope Mastery

Move beyond basic functions to closures, higher-order functions, recursion, this context, and modern parameter patterns.

  1. Higher-Order Functions 18 min
  2. Callbacks & Closures 22 min
  3. Default, Rest & Spread Parameters 19 min
  4. IIFE & The Module Pattern 18 min
  5. Recursion Basics 19 min
  6. Function Context & this 18 min

Module 4 · Objects, Classes & Data Structures

Master object behavior, prototypes, classes, modern collections, destructuring, and JSON for robust data modeling.

  1. Object Methods & this 19 min
  2. Constructors & Prototypes 19 min
  3. Classes & Inheritance 19 min
  4. Maps, Sets & Weak Collections 19 min
  5. Destructuring Objects & Arrays 19 min
  6. JSON Serialization & Parsing 19 min

Module 5 · Asynchronous JavaScript

Write non-blocking code with callbacks, Promises, async/await, and handle errors in concurrent operations.

  1. The Event Loop & Callbacks 19 min
  2. Promises Fundamentals 19 min
  3. Promise Chaining 19 min
  4. Async/Await 19 min
  5. Error Handling in Async Code 19 min
  6. Concurrent Operations with Promise.all 19 min

Module 6 · Modern JavaScript & Tooling Concepts

Adopt professional ES6+ features including modules, iterators, generators, symbols, and safe property access patterns.

  1. ES6 Modules 19 min
  2. Template Literals & Tagged Templates 19 min
  3. Optional Chaining & Nullish Coalescing 19 min
  4. Iterators & Generators 18 min
  5. Symbols & Well-Known Symbols 18 min

Module 7 · Error Handling, Debugging & Testing

Build reliable programs with structured error handling, defensive debugging techniques, and automated unit tests.

  1. try...catch...finally 19 min
  2. Throwing Custom Errors 19 min
  3. Debugging Strategies 19 min
  4. Unit Testing with assert 19 min
  5. Test-Driven Development 19 min

Module 8 · Functional & Advanced Patterns

Apply functional programming principles and proven patterns to write clean, reusable, and maintainable code.

  1. Pure Functions & Immutability 18 min
  2. Currying & Partial Application 18 min
  3. Memoization 18 min
  4. Composition & Pipe 18 min
  5. Design Patterns in JavaScript 18 min

Module 9 · Algorithms & Data Structures in JavaScript

Analyze complexity and implement essential data structures and algorithms using JavaScript primitives and collections.

  1. Big-O Basics 19 min
  2. Arrays vs. Linked Lists 18 min
  3. Stacks & Queues 18 min
  4. Searching & Sorting 18 min
  5. Hash Tables with Maps 18 min
  6. Trees & Graphs Basics 18 min

Module 10 · Capstone - Real-World Projects

Synthesize everything into milestone projects that demonstrate professional JavaScript problem solving without DOM or network access.

  1. Project Specifications & Planning 19 min
  2. Capstone — Build a Word Tally Tool 19 min
  3. Project — Expense Tracker 20 min
  4. Project — Module Bundler Simulation 20 min
  5. Project — API Client Simulation 20 min
  6. Project Polish & Reflection 19 min