All roadmaps

The JavaScript roadmap

Every JavaScript lesson we teach, laid out as one path. Each station is a stage; tap any lesson to open it. Stations turn teal as you finish them.

Legend:Lesson stageStage completeTap a lesson to open it
01

Language Foundations

How JavaScript Runs
Variables & Scope: let, const, var
Data Types & Primitives
Operators & Type Coercion
02

Values & Expressions

Strings & Template Literals
Numbers, BigInt & Math
Type Conversion
null, undefined & NaN
03

Control Flow

Conditionals: if, switch, ternary
Loops: for, while, for...of, for...in
Iterables & the Iteration Protocol
04

Functions

Functions: Declarations, Expressions & Arrows
Hoisting & the Temporal Dead Zone
Scope Chain & Closures
The this Keyword & Binding
Higher-Order Functions & Callbacks
Recursion & the Call Stack
05

Objects

Objects: Properties & Methods
References, Copying & structuredClone
Destructuring, Spread & Rest
Object Methods & Property Descriptors
06

Prototypes & Classes

The Prototype Chain
Classes: Syntax & Inheritance
Private Fields, Getters & Static
this in Classes & Method Binding
07

Collections & Data

Arrays: Create, Mutate & Access
Array Iteration: map, filter, reduce
Map, Set, WeakMap & WeakSet
JSON: parse & stringify
08

Asynchronous JavaScript

The Event Loop: Call Stack, Queue & Microtasks
Callbacks & Callback Hell
Promises: then, catch & chaining
async / await
Promise Combinators
09

Browser Web APIs

Fetch, AJAX & HTTP
Web Storage: localStorage, cookies & IndexedDB
Timers & requestAnimationFrame
Observer APIs: Intersection, Mutation & Resize
Web Workers & Off-Main-Thread
10

DOM & Events

The DOM Tree
The DOM: Selecting & Traversing
DOM Manipulation
Events & Listeners
Bubbling, Capturing & Delegation
Forms & User Input
11

Modern JS & Modules

ES Modules: import & export
Optional Chaining & Nullish Coalescing
Symbols & Well-Known Symbols
Generators & Iterators
12

Metaprogramming & Advanced

Proxy & Reflect
Error Handling: try/catch & custom errors
Memory, References & Garbage Collection
13

Text & Time

Regular Expressions
Dates, Time & Intl
14

Patterns & Performance

Debounce & Throttle
Memoization & Currying
Design Patterns: Module, Factory, Observer
Immutability & Pure Functions
Performance & Rendering
15

Tooling, Debugging & Testing

Debugging & the Console
Testing Basics
Data Structures & Big-O
16

Interview Gotchas

Classic JS Gotchas & Quiz