We can build our user interfaces by manually calling React.createElement, but as we add more elements, it becomes harder and harder to read the structure we have built. If you write a div in JSX, it's actually the equivalent of calling React.createElement(). Though JSX looks like HTML, under the hood it is actually JavaScript function calls. In short, it is HTML + JavaScript for structuring our React apps. JSX is a way of building React user interfaces that uses the simple syntax of HTML, but adds the functionality and dynamic nature of JavaScript. React was created for building single-page apps in particular, but you can make everything from static sites to mobile apps with the same React concepts. #React fragments update#React takes care of updating our UI when our data changes, without the need to update the DOM manually ourselvesĮxtra Credit: There are frameworks in React that give you everything you need to build an app (with little to no third-party libraries), like Next.js and Gatsby.It allows us to create reusable behavior across any of our components with React hooks.It gives us components to easily share parts of our user interface (UI), which static HTML itself cannot do.It gives us a way to easily create user interfaces with tools like JSX.We use React because it gives us all the power of JavaScript, but with built-in features that improve the way we build and think about building applications. React is a JavaScript library, not a framework. #React fragments pro#Let's get started! Want the #1 resource to become a hired React developer? Become a React pro in 4-5 weeks with the React Bootcamp. To get the best results out of this guide, make sure to try to answer each question yourself before looking at the answers. These questions cover everything from the core concepts of React to a practical understanding of when you should use certain features. I have selected all of the major questions you should know as a React developer in 2022, whether you are interviewing for a hired position or not. It works perfectly fine.Feel confident about your React knowledge? Put it to the test! Here, we can say props.name, and we can possibly pass in name over here. Now, the best thing about fragments is that you can also pass in props into this. Also, we don't have that weird extra division tag. This will act as the enclosing tag, but once it reloads, you can see that it's working perfectly fine. To tackle this, we are going to use the fragment component, which can be used instead of the division element. Then once we reload it, you can see that it no longer throws the errors, since each element has its own key. If we provide them with unique keys, this problem will go away. If you check the console, you can see that we have an error saying that each child in an array iterator should have a unique key code. We can actually change this is an array, where each division is an element in the array. One possible solution that you have is just remove this. That means this return function should only return one single component, or one single HTML element. That is why we had the original division in place. That means this header and this footer are two JSX elements that additional, and both of them should be enclosed into one single tag. You can see that it's failed, and the error that it's given us, syntax error, additional JSX elements must be wrapped in an enclosing tag. Let's just go ahead and delete this, and see what happens. If you look at our tree structure, you can see that we have one extra division, that is this division, that is enclosing the header and footer. The header/footer component is a stateless component which returns this one, single big division that contains two small divisions, with header and footer. Instructor: I have a basic React project set up over here, and the app contains a simple component that is the header/footer component.
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