React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your …

React doesn’t require using JSX, but most people find it helpful as a visual aid when working with UI inside the JavaScript code. It also allows React to show more useful error and warning …

In React world, the term “virtual DOM” is usually associated with React elements since they are the objects representing the user interface. React, however, also uses internal objects called …

Unlike browser DOM elements, React elements are plain objects, and are cheap to create. React DOM takes care of updating the DOM to match the React elements. Note: One might confuse …

Normally, JavaScript expressions inserted in JSX will evaluate to a string, a React element, or a list of those things. However, props.children works just like any other prop in that it can pass …

First, let’s review how you transform lists in JavaScript. Given the code below, we use the map() function to take an array of numbers and double their values.

Grâce à React, il est facile de créer des interfaces utilisateurs interactives. Définissez des vues simples pour chaque état de votre application, et lorsque vos données changeront, React …

To solve this problem for React users, React 16 introduces a new concept of an “error boundary”. Error boundaries are React components that catch JavaScript errors anywhere in their child …

You might be curious how React knows which component useState corresponds to since we’re not passing anything like this back to React. We’ll answer this question and many others in the …

Hooks don’t replace your knowledge of React concepts. Instead, Hooks provide a more direct API to the React concepts you already know: props, state, context, refs, and lifecycle.