Array Methods
Transform and search data with map, filter, reduce, find and sort.
Self-paced mini-course
$199
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JavaScript & TypeScript Courses
You learn the language, then the DOM, then async code and APIs. Experienced developers can join the TypeScript bootcamp.
Start here: Array Methods, beginner, $199.
All JavaScript courses
Sorted from beginner to advanced.
Vanilla JS Mini Apps
Build five small apps in plain JavaScript: a timer, a quiz, a tip calculator, a to-do list and a color picker.
Self-paced course
$299
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Modern ES6+ Syntax
Write modern JavaScript with let and const, arrow functions, destructuring, spread and optional chaining.
Project-based
$399
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JavaScript Fundamentals
Learn variables, functions, arrays and objects by writing small programs that run in the browser.
Guided project
$499
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TypeScript Foundations
Add types to JavaScript with TypeScript: annotations, interfaces, unions and generics.
Guided project
$499
View course →
DOM Programming
Make pages respond to clicks, typing and form input by working with the DOM.
Self-paced mini-course
$199
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JavaScript Modules
Split JavaScript into ES modules with imports, exports and a simple build step.
Self-paced course
$299
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TypeScript for Frontend
Use TypeScript in front-end code: DOM types, events, fetch responses and component props.
Self-paced course
$299
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Async JavaScript
Fetch data, handle loading and errors, and write async code with promises and async/await.
Project-based
$399
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Object-Oriented JavaScript
Model data and behavior with classes, prototypes, getters and private fields.
Project-based
$399
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Functional JavaScript
Write clearer JavaScript with pure functions, immutability and composition.
Project-based
$399
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Browser Storage
Save data in the browser with localStorage, sessionStorage and IndexedDB.
Project-based
$399
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JavaScript Debugging
Find bugs faster with breakpoints, the console and a repeatable debugging process.
Project-based
$399
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JavaScript Testing Basics
Write unit tests for JavaScript with Vitest: assertions, mocks and test-driven fixes.
Project-based
$399
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API Data with JavaScript
Build a front end that searches, filters and pages through data from a public API.
Guided project
$499
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Interactive UI Widgets
Build accessible UI widgets in plain JavaScript: modal, tabs, carousel, autocomplete.
Guided project
$499
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Advanced TypeScript
Type complex applications with generics, conditional types and strict compiler settings in a small-group bootcamp.
Bootcamp
$1,999
View bootcamp →