JavaScript

Core JavaScript from the ground up. Variables, functions, closures, the event loop, async/await, the DOM, fetch API, modules, and the patterns every JS developer must know.

BeginnerTopics 1–12

·What is JavaScript
·Variables & Data Types
·Operators
·Control Flow
·Loops
·Functions
·Scope & Hoisting
·Arrays
·Objects
·The DOM
·Events
·Fetch API

Start Beginner →

IntermediateTopics 13–25

·Closures
·The this Keyword
·Prototypes
·Classes
·Destructuring
·Spread & Rest
·Promises
·async/await
·Error Handling
·ES Modules
·Array Methods
·Map & Set
·Regular Expressions

Start Intermediate →

AdvancedTopics 26–38

·The Event Loop
·Generators & Iterators
·Symbol
·WeakMap & WeakRef
·Proxy & Reflect
·Web APIs & Timers
·Memory Management
·Web Workers
·TypedArrays & Buffers
·Dynamic Import
·Security (XSS, CSP, CORS)
·Performance & Profiling
·Service Workers & PWA

Start Advanced →

PatternsTopics 39–50

·Design Patterns
·Functional Programming
·Immutability
·Currying & Composition
·Memoization
·The Module Pattern
·Event-Driven Architecture
·Async Patterns
·Testing with Jest
·Bundlers (Vite & Webpack)
·Package Management
·TypeScript Essentials

Start Patterns →