Components come in two types, Class components and Function components, in this tutorial we will concentrate on Function components. In older React code bases, you may find Class …

When creating a React component, the component's name must start with an upper case letter. The component has to include the extends React.Component statement, this statement …

In React, form elements like <input>, <textarea>, and <select> work a bit differently from traditional HTML. In standard HTML, form elements maintain their own value based on user …

The React useState Hook allows us to track state in a function component. State generally refers to data or properties that need to be tracking in an application.

The component at the top and bottom of the stack need access to the state. To do this without Context, we will need to pass the state as "props" through each nested component.

React is a JavaScript library for building user interfaces. React is used to build single-page applications. React allows us to create reusable UI components. Start learning React now 🏁

Using memo will cause React to skip rendering a component if its props have not changed. This can improve performance. This section uses React Hooks. See the React Hooks section for …

Just like with CSS Modules, styles created in CSS-in-JS are scoped to the component. They are given unique names and can only be used in the component that imports them.

CSS Modules are convenient for components that are placed in separate files. The CSS inside a module is available only for the component that imported it, and you do not have to worry …

Example Get your own React.js Server Before: hello = function() { return "Hello World!"; } Try it Yourself »