React JS is a new frontend development framework that makes creating interactive UIs easier and more efficient. Its modular architecture makes it easy to update individual components without re-writing entire code bases. This allows developers to maintain their applications more efficiently, and it minimizes time spent on maintenance and modernization.
To achieve this, React uses a Virtual DOM (Document Object Model), which allows components to operate independently. This avoids the need for a page reload after each action. For example, you can implement a subscription button that requires the user to change the message displayed on it. For this, you can implement a method called changeMessage which calls setState().
Facebook, a social networking website, needed a way to provide a more interactive and rich user experience. To address this problem, Jordan Walke created React to streamline the development process and make the creation of dynamic and interactive interfaces easier. It was used for the first time for Facebook’s newsfeed, and quickly gained popularity in the JavaScript ecosystem.
The virtual DOM allows for faster updates to the DOM. It can improve performance by only updating relevant elements. For example, in the past, you would have to reload the entire page each time you changed the content on a post. Instead, React generates a virtual DOM for the JSX elements, which updates the DOM without requiring the entire page to be loaded.
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