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JavaScript

The language of the web — make pages interactive and build apps that run anywhere.

JavaScript runs in every browser and on servers with Node.js. Start from zero — variables, types, decisions, loops and functions — then master arrays, objects, the DOM, events and forms. Go on to classes, modules, asynchronous code with promises and async/await, talking to APIs with fetch, and finish with generators, debugging, Node.js, TypeScript and professional best practices. Everything is modern ES2023+ JavaScript.

34 lessons ~8 h 38 min Beginner → Advanced

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What you’ll learn

  • Run JavaScript in the browser console and with Node.js, and debug it with DevTools
  • Use let/const, types, operators and control flow without falling into coercion traps
  • Write functions, closures and callbacks, and understand scope, hoisting and `this`
  • Transform data fluently with array methods, destructuring, spread, Map and Set
  • Build interactive pages: select and create DOM elements, handle events and validate forms
  • Model data with classes, prototypes and inheritance, and organise code into ES modules
  • Write asynchronous code with promises and async/await, and explain the event loop
  • Call REST APIs with fetch, handle JSON and errors, and persist data with localStorage
  • Use npm and Node.js tooling, and add type safety with TypeScript
  • Write fast, readable, maintainable JavaScript that follows modern best practices

Syllabus

6 modules · 34 lessons
  1. 1Introduction to JavaScriptWhere JavaScript runs, the browser console, Node.js and adding scripts to a page.
  2. 2Variables & typeslet, const and var, the primitive types, typeof, and === vs ==.
  3. 3Operators & type coercionArithmetic, comparison and logical operators — and how JavaScript converts types behind your back.
  4. 4Strings & template literalsQuotes, escapes, template literals and the string methods you will use every day.
  5. 5Conditionalsif/else, the ternary operator, switch, and truthy/falsy values in decisions.
  6. 6Loopsfor, while, do…while, for…of, for…in, break and continue.
  7. 7FunctionsDeclarations, expressions, arrow functions, default and rest parameters, spread and callbacks.
  8. 8Scope, hoisting & closuresBlock, function and global scope, hoisting and the temporal dead zone, and closures.
  1. 17`this`, call, apply & bindHow `this` is decided, why arrow functions differ, and controlling it with call, apply and bind.
  2. 18Prototypes, classes & inheritanceThe prototype chain, class syntax, constructors, getters/setters, static and #private members, extends and super.
  3. 19Error handlingtry/catch/finally, throwing errors, custom error classes, error.cause and defensive code.
  4. 20Modules: import & exportNamed and default exports, ES modules in the browser and Node, dynamic import() and top-level await.
  5. 21Map, Set, WeakMap & WeakSetKeyed collections, unique values, the new Set methods and when weak references help.
  6. 22Regular expressionsPatterns, flags, character classes, groups, named captures and replace/matchAll.
  7. 23Dates & IntlCreate and compare Dates, time zones, and format dates, numbers and currencies with Intl.
  8. 24Modern JavaScript featuresOptional chaining, nullish coalescing, logical assignment, at(), Object.groupBy and more.