ReactJS

ReactJS Dev Tools

React DevTools helps developers inspect the component tree, props, state, hooks, and rendering behavior. It is one of the most important tools for diagnosing React applications. Components panel

ReactJS

TypeScript with React

TypeScript gives React applications compile-time checks for props, state, API models, events, hooks, and reusable components. It is especially valuable in large teams because it makes contracts between components and services explicit.

ReactJS

Unit Testing — Jest / Vitest

Unit testing verifies small pieces of application logic in isolation. In a React application this commonly means testing utility functions, reducers, selectors, validation rules, hooks, and business logic without rendering the complete application. A strong test suite checks behavior rather than implementation details.

ReactJS

Closures, Callbacks & Functions in React

Functions are everywhere in React. Event handlers, callbacks, array operations, effects, custom hooks, and component logic all depend on JavaScript functions.

ReactJS

Props and state

React Hooks are functions that let function components use React features such as state, effects, references, context, and other capabilities.