What Is React And How Does It Work

React DOM takes care of updating the DOM to match the React elements. The reason for this is that JavaScript is very fast and it’s worth keeping a DOM tree in it to speed up its processing. We call this structure a tree, and it allows us to assign responsibility for a state to one component.

However, many React developers do not understand how rendering works in React. The general notion is that we write components that return JSX (JavaScript XML). The JSX is then

Hello this.props.name

somehow converted into actual HTML DOM elements displayed on the screen. They’re also a little faster to execute, as they don’t have lifecycle methods.
It’s not a full-stack solution that’s going to handle everything from the database to real-time updates over web socket connections. We don’t actually want most of these pre-packaged solutions, because in the end, they usually cause more problems than they solve. Using JavaScript, React Native allows you to create native cross-platform mobile apps. Designing an app is complicated at the best of times, so anything that will make it simpler is always welcome.

Now, whenever we see things mixed together, we automatically assume that this is bad and shouldn’t happen. The index.css file contains global styling and the App.css file almost works the same as it does for the App.js file – but whether we use a CSS file is entirely up to us. While getting started, we can choose to delete one and use only one CSS file. This is where all of your components will eventually meet. The name of the file isn’t important, but it’s good practice to keep this name so that other developers can understand your code. If you are interested in learning how to create a React app manually without create-react-app, you can check out this guide.

How re-rendering impacts performance

Everyone needs similar codes at some point, so don’t reinvent the wheel, just make a point of working smarter, not harder. Using code that manages basic ideas is just a better way to do it. Typically, you request a webpage by typing its URL into your web browser. Your browser then sends a request for that webpage, which your browser renders.
What is React and how does it work
It’s a downward flow programming method, so anything that is changed will not affect what is upstream from it. While we know React is written in JavaScript, why should that matter so much? It matters because JavaScript is one of the most used programming languages in the world. In fact, 9.7 million developers use it for their programming needs, making it the best choice for a wide-spread building platform.

Server-side rendering SSR made easy with React

So when we type anything in the textbox, we’re updating the state with the value typed by passing an object to the setState function. As the number of event handlers increases, the number of .bind calls also increases. We can avoid doing this using the class properties syntax. Also, to declare the state, we have to create a constructor, add a super call inside it, and then we can declare the state. We’re using the arrow function in the above code, but using a normal function will also work.
What is React and how does it work
This form component would have nested field components that it passes its state to in order to populate them. Components in React can manage What is React their own state and communicate that state to child components. By “state,” we mean the data that populates the web application.

  • What you picture could look like the screen below, with a navbar, a header, a filter, and a list.
  • Or, if you’d rather learn by doing, you can jump right in with our Learn React course.
  • It will create a brand new React app in your browser that you can start working with.
  • When directly working with the DOM API, we’d have to specify what element to change at the right time, in the right order.

But still, it’s not feasible to call the renderContent function every time we want to update the UI. Here, we’ve moved the content JSX and  ReactDOM.render method call inside a renderContent function. Then once it’s defined, we’re calling the function so it will render the content on the UI on page load. Properties or Props are built-in React object that saves the value of a tag’s attributes and function similarly to HTML attributes. It makes it possible to send data from one component to another like arguments are passed in a function. Dioxus, a Rust library, allows you to build cross-platform UI components.
What is React and how does it work
Additionally, React’s one-way data binding between elements streamlines the debugging process. Any modifications to child components won’t affect the parent structure, reducing the risk of errors. Furthermore, React allows you to nest components within others to create complex functions without bloating the code. Each React component has its controls, making maintenance seamless. Hundreds of major companies worldwide, such as Netflix, Airbnb, and American Express, use React to build their web apps. In this section, we’ll discuss the reasons why many developers choose React over its counterparts.

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