Production-ready code examples you can copy and use immediately. Learn by doing.
ES6+, async/await, promises, arrays
Hooks, components, patterns
Express, APIs, middleware
Types, interfaces, generics
Chatbots, RAG, Function Calling
JavaScript
async function fetchData(url) {
try {
const res = await fetch(url);
...React
function useLocalStorage(key, initial) {
const [value, setValue] = ...Node.js
const authMiddleware = (req, res, next) => {
const token = ...TypeScript
function getProperty<T, K extends keyof T>(
obj: T, key: K
) ...