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    react

React is a JavaScript library for building user interfaces.


Version published
Weekly downloads
24M
decreased by-1.74%
Maintainers
7
Install size
329 kB
Created
Weekly downloads
 

Package description

What is react?

The react npm package is a JavaScript library for building user interfaces, particularly for single-page applications. It allows developers to create reusable UI components and manage the state of their applications efficiently.

What are react's main functionalities?

Component-Based Architecture

React allows developers to encapsulate UI logic and design into components, which can then be composed to build complex user interfaces.

class Welcome extends React.Component {
  render() {
    return <h1>Hello, {this.props.name}</h1>;
  }
}
ReactDOM.render(<Welcome name='Jane' />, document.getElementById('root'));

State Management

React provides a way to manage the state within components, enabling dynamic and interactive user interfaces.

class Counter extends React.Component {
  constructor(props) {
    super(props);
    this.state = { count: 0 };
  }
  increment = () => {
    this.setState({ count: this.state.count + 1 });
  };
  render() {
    return (
      <div>
        <p>{this.state.count}</p>
        <button onClick={this.increment}>Increment</button>
      </div>
    );
  }
}

Lifecycle Methods

React components come with lifecycle methods that are invoked at specific points in a component's lifecycle, allowing developers to hook into the component's creation, updating, and destruction processes.

class Timer extends React.Component {
  componentDidMount() {
    this.timerID = setInterval(() => this.tick(), 1000);
  }
  componentWillUnmount() {
    clearInterval(this.timerID);
  }
  tick() {
    this.setState({
      date: new Date()
    });
  }
  render() {
    return (
      <div>
        <h2>It is {this.state.date.toLocaleTimeString()}.</h2>
      </div>
    );
  }
}

Hooks

Hooks are functions that let developers 'hook into' React state and lifecycle features from function components. They provide a way to use stateful logic without writing a class.

import { useState, useEffect } from 'react';

function Example() {
  const [count, setCount] = useState(0);

  useEffect(() => {
    document.title = `You clicked ${count} times`;
  });

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

Other packages similar to react

Changelog

Source

18.2.0 (June 14, 2022)

React DOM

  • Provide a component stack as a second argument to onRecoverableError. (@gnoff in #24591)
  • Fix hydrating into document causing a blank page on mismatch. (@gnoff in #24523)
  • Fix false positive hydration errors with Suspense. (@gnoff in #24480 and @acdlite in #24532)
  • Fix ignored setState in Safari when adding an iframe. (@gaearon in #24459)

React DOM Server

  • Pass information about server errors to the client. (@salazarm and @gnoff in #24551 and #24591)
  • Allow to provide a reason when aborting the HTML stream. (@gnoff in #24680)
  • Eliminate extraneous text separators in the HTML where possible. (@gnoff in #24630)
  • Disallow complex children inside <title> elements to match the browser constraints. (@gnoff in #24679)
  • Fix buffering in some worker environments by explicitly setting highWaterMark to 0. (@jplhomer in #24641)

Server Components (Experimental)

  • Add support for useId() inside Server Components. (@gnoff in #24172)

Readme

Source

react

React is a JavaScript library for creating user interfaces.

The react package contains only the functionality necessary to define React components. It is typically used together with a React renderer like react-dom for the web, or react-native for the native environments.

Note: by default, React will be in development mode. The development version includes extra warnings about common mistakes, whereas the production version includes extra performance optimizations and strips all error messages. Don't forget to use the production build when deploying your application.

Usage

import { useState } from 'react';
import { createRoot } from 'react-dom/client';

function Counter() {
  const [count, setCount] = useState(0);
  return (
    <>
      <h1>{count}</h1>
      <button onClick={() => setCount(count + 1)}>
        Increment
      </button>
    </>
  );
}

const root = createRoot(document.getElementById('root'));
root.render(<App />);

Documentation

See https://reactjs.org/

API

See https://reactjs.org/docs/react-api.html

Keywords

FAQs

Last updated on 14 Jun 2022

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