React JS is a library for developing web applications. It is written in JavaScript and uses the DOM as its core model. It allows for client-side routing, which means that a single page doesn’t have to reload in order to change the content. React’s virtual DOM makes this possible by creating a copy of the real DOM that React uses to update sections of the page. It does this in a way that takes much less time than Document Object Model (DOM) rendering.
The architecture of React consists of components, each with their own set of properties and functions. The components flow data from one parent component to another. The top-level component is known as the “App” component. Another important concept in React is state. A state object stores a set of observable properties that can change as the user interacts with the interface.
A React component’s state can be updated using the setState() method. The setState() method enables JS to enqueue updates and tells React to re-render the component in response to the change in the state. For example, a subscribe button needs to change its message to display a new message when the user clicks it. In order to accomplish this, the subscribe button uses the setState() method, which calls the changeMessage method. The changeMessage method then uses the setState() method to update the message displayed in the sub.
The React framework allows developers to build complex UI interactions with a minimum of effort. It is a fast and easy-to-use JavaScript framework. It also provides a fault-tolerant frontend.
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