What is ReactJS?
React JavaScript, also referred to as React.js or ReactJS, is an open-source library for front-end user interfaces. Facebook (now Meta) originally developed ReactJS to build web and mobile applications. Meta, along with a large community of contributing developers, continues to maintain React. The React library is built on components where each component is a piece of functionality such as a button.
Why use ReactJS versus plain old JavaScript? Imagine you have a web page in an application that has two buttons in different colors. Using JavaScript, you’d need to build and maintain the code for each button independently. This creates a lot of extra work and problems with code manageability. With React, you build a component, then style each use of that component using ReactJS “props” (short for properties).
This makes it both faster to build apps and easier to maintain and change them in the future.
When is React the right choice?
ReactJS is particularly strong for single-page applications or applications that include pages with different panels or sections in which data needs to be loaded and rendered, but reloading the entire page deteriorates the user experience. This is because ReactJS can reload data on a page without having to reload the entire page. Imagine a web application that includes a set of tiles at the top with summary data and a data table below with detailed row-by-row information, and that the data in the tiles needs to be updated automatically when it changes on the backend. React can handle updates to each tile or to the data table without having to refresh the entire page.
What is built with React?
React is one of the most popular JavaScript libraries in the development community. Many of the most successful software applications use React. Examples include:
Facebook. The social networking site uses React JavaScript extensively for its web app, showcasing its capabilities in handling dynamic content and vast amounts of user data.
Instagram. React JavaScript helps power many parts of Instagram’s web application, providing a smooth, dynamic user experience with interactive features and real-time updates.
WhatsApp Web. The web version of the popular messaging app uses React JavaScript to offer seamless synchronization with the mobile app, supporting real-time messaging, notifications, and more.
Airbnb. Known for its innovative approach to UI/UX, Airbnb uses React JavaScript to create a responsive, intuitive platform for booking accommodations and experiences.
Netflix. The streaming giant employs React JavaScript for its platform’s low-latency, highly interactive user interfaces, enhancing the browsing and watching experience.
New York Times. For their website, React JavaScript is used to manage interactive storytelling and multimedia content, offering readers a rich, engaging experience.
Dropbox. The file hosting service uses React JavaScript in parts of its web interface, improving user interaction and efficiency in file management tasks.
Uber. Uber’s web interface for riders and drivers leverages React JavaScript to handle real-time data and provide a smooth, map-intensive user experience.
Twitter. The Twitter Lite web app uses React JavaScript, among other modern web technologies, to provide a fast, efficient, and more accessible version of Twitter.
Asana. The project management tool uses React JavaScript to offer a dynamic, responsive interface for managing tasks, projects, and teams effectively.