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6 paź 2024 · React uses an HTML-in-JavaScript syntax called JSX (JavaScript and XML). Familiarity with both HTML and JavaScript will help you to learn JSX, and better identify whether bugs in your application are related to JavaScript or to the more specific domain of React.
Quick Start. Welcome to the React documentation! This page will give you an introduction to the 80% of React concepts that you will use on a daily basis. You will learn. How to create and nest components. How to add markup and styles. How to display data. How to render conditions and lists. How to respond to events and update the screen.
Components are independent and reusable bits of code. They serve the same purpose as JavaScript functions, but work in isolation and return HTML via a render () function. Components come in two types, Class components and Function components, in this chapter you will learn about Class components.
16 kwi 2024 · In React, there are two primary ways to create components: function and class components. Each has its own syntax and use cases, although with the introduction of React Hooks, the gap between them has narrowed significantly.
React components use props to communicate with each other. Every parent component can pass some information to its child components by giving them props. Props might remind you of HTML attributes, but you can pass any JavaScript value through them, including objects, arrays, and functions.
The simplest way to define a component is to write a JavaScript function: functionWelcome(props){return<h1>Hello, {props.name}</h1>;} This function is a valid React component because it accepts a single “props” (which stands for properties) object argument with data and returns a React element.
useContext is a React Hook that lets you read and subscribe to context from your component. const value = useContext(SomeContext) Reference. useContext(SomeContext) Usage. Passing data deeply into the tree. Updating data passed via context. Specifying a fallback default value. Overriding context for a part of the tree.
