How React JS Works?

React JS works by using a declarative programming model to manage the state and appearance of user interfaces in web applications. Here is a brief overview of how React JS works:

1. React Components: React JS is based on the concept of components, which are reusable pieces of code that represent different parts of a user interface. Components can be nested within each other to create complex user interfaces.
2. Virtual DOM: React JS uses a virtual DOM (Document Object Model) to manage the state and appearance of the user interface. The virtual DOM is a lightweight copy of the real DOM that React uses to keep track of changes to the user interface.
3. State Management: React JS uses a state management system to manage the data and state of components. This allows components to be updated automatically when the state changes, without the need for manual updates.
4. JSX Syntax: React JS uses a syntax called JSX (JavaScript XML) to define the structure and appearance of components. JSX is a combination of JavaScript and HTML-like syntax that allows developers to write component code in a more intuitive and efficient way.
5. Lifecycle Methods: React JS provides a set of lifecycle methods that allow developers to control how components are rendered and updated. These methods can be used to perform actions such as initialization, updating, and unmounting of components.
6. React Router: React JS also provides a routing library called React Router, which allows developers to manage the navigation and routing of web applications. React Router allows for dynamic loading of components based on the URL, making it easier to build complex single-page applications.

In conclusion, React JS works by using a declarative programming model to manage the state and appearance of user interfaces in web applications. It uses components, virtual DOM, state management, JSX syntax, lifecycle methods, and React Router to create dynamic and efficient web applications.