Things To Know About React 18

React 18 is the latest version of the popular JavaScript library for building user interfaces. It was released on September 17, 2021. It includes several new features and improvements, such as improved server-side rendering, improved support for concurrent mode, and new debugging tools. Developers can upgrade to React 18 by updating their dependencies in their package.json file and following the instructions in the React 18 upgrade guide.

React is Design Oriented

React is a JavaScript library that is primarily focused on building user interfaces and managing the state of those interfaces.

It is designed to allow developers to create reusable, modular components that can be easily composed to create complex interfaces. React encourages a component-based design approach, which helps to make code more readable, maintainable, and testable. React’s declarative nature also allows developers to more easily reason about the state of an interface and how it will change over time, making it easier to build and maintain large and complex applications.

Features and Updates

React 18 Concurrent Mode

React 18’s Concurrent Mode is a set of features that allow React applications to be more responsive and performant by allowing the JavaScript runtime to work on multiple tasks at the same time. This is achieved by allowing React to schedule updates and rendering work in the background, so that the user interface can continue to respond to user input and other events, even while updates are being processed.

Concurrent mode works by introducing the concept of “priority levels” to updates. Higher priority updates, such as those caused by user interactions, are processed immediately, while lower priority updates, such as those caused by background data loading, are deferred until the higher priority updates are finished. This allows the application to remain responsive and smooth, even when dealing with large amounts of data or complex updates.

New Suspense Features

React 18’s Concurrent Mode includes a new feature called “Suspense” that allows React to pause rendering and wait for certain data to be loaded before continuing. This can help to prevent the “waterfall” of updates that can occur when data is loaded asynchronously and can improve the perceived performance of an application.

New Suspense Features

Streaming server rendering is a feature in React 18 that allows React to stream the initial HTML of a page to the browser as it is being generated, rather than waiting for the entire HTML to be generated before sending it to the browser. This can help to improve the perceived performance of an application by allowing the browser to start rendering the page before the entire HTML has been received.

Automatic Batching

Automatic batching is a feature in React 18 that allows React to automatically group and batch together multiple updates to the user interface, so that they can be applied in a single render pass. This can help to improve the performance of an application by reducing the number of times the user interface needs to be re-rendered.

In previous versions of React, updates to the user interface were applied immediately, which can cause the user interface to re-render multiple times for a single event or action. Automatic batching in React 18 allows React to group and batch together multiple updates, so that they can be applied in a single render pass. This can help to reduce the number of times the user interface needs to be re-rendered, which can improve the performance of the application.

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