What Is ReactJS? ReactJS Basics| Learn ReactJS| Frontend Development with Meta

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I'm sure you've created something from scratch before. I bet you realize how challenging it can be as opposed to using pre made components. Think about the effort that goes into building a brand new house versus the convenience of constructing a modular building with pre made components that you just need to put together. React is focused on working with components, which makes it simple to build functional user interfaces on web and mobile. And, since React is one of the most popular JavaScript libraries, it's important that you can explain what its purposes and describe how its components work together. Available since 2013 React is an open source library with a community of core contributors and companies that maintain it. Developers use React to develop single page applications and you can also develop mobile applications with React native. When you develop an app, you can choose to use React to develop the user interface. But building an application requires more than that. You must also consider the navigation and how the app will request data from a web server. Therefore React is used in conjunction with other JavaScript libraries during development. But what makes React so useful is that it allows developers to write less code to create functionality. This in turn makes it easier to maintain code in the long term and simplifies testing. Because it is so central to front end development, there are many tools that you can use with the React. These tools can help you understand how React is running your code and how you can improve performance. Now that you have a better idea of what React is let me tell you more about Reacts components. The key concept behind React is that it allows you to define components that you can combine to build a web application. A component is basically a small piece of user interface, such as a music player or photo gallery. This component model allows you to do several things, such as developing and testing parts of their application in isolation and it also allows you to reuse components across multiple sections of the application as well. Let's explore an example. Most Web applications have user profiles with pictures. Normally several parts of the application use a version of this profile picture, such as in the navigation bar beside the user's name. It could also show in a user search result along with several other user pictures and the user picture might also display an instant message notifications. Instead of programming the logic for every instance of a user profile picture React allows you to create a user icon component that displays a version of a profile picture every time it is used. You can then reuse this component throughout the application. Can you imagine how it will improve your efficiency. There are in fact many open source libraries that provide pre made components for React projects. For example, if you want to add a video player to your website, there's a React component library for that. Well, maybe you want to embed a map. There's a React component library for that too. As the React community grows bigger, it continues to add new features and improvements continuously. Annual React conferences, encourage community sharing and introduce upcoming developments in the library. I hope that in the near future you might be joining the React community as an active member and as a future React community member you now know the React libraries purpose and how its components work together to make life easier for front end developers. After all, why build something from scratch if the components are already there to use?

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