React

What is React?

React is an open-source JavaScript library from Meta (Facebook) for building user interfaces. React makes it easy to build complex, interactive UIs with reusable components. It is the most popular frontend library and is used by Facebook, Instagram, Netflix, Airbnb and millions of other applications.

Why React is useful

Modern web applications require dynamic, responsive interfaces that react quickly:

• Component-based: Build UI from reusable, independent building blocks
• Virtual DOM: Lightning-fast rendering by only updating changed elements
• Large ecosystem: Thousands of libraries, tools and a huge community
• React Native: Use the same knowledge to build mobile apps

Time savings with React

React reduces duplication through reusable components. Build once, deploy everywhere — from web applications to mobile apps.

Hidden features that often go unused

Many developers only use a fraction of what React can do:

• Error Boundaries: Catch errors in components without crashing the entire app.
• React.memo & useMemo: Prevent unnecessary re-renders for better performance.
• useReducer: Manage complex state logic without external libraries.
• Portals: Render content outside the parent DOM hierarchy (modals, tooltips).
• Custom Hooks: Extract and share logic between components.
• Concurrent Features: Prioritise updates for a smoother user experience.

Integrations with other tools

React integrates with many other tools and services:

• TypeScript: Type-safe React development for more reliable applications.
• Next.js: React framework with SSR, routing and optimisations out of the box.
• GraphQL: Efficient data fetching with Apollo Client or Relay.