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React
Original author(s)Jordan Walke
Developer(s)Meta and community
Initial releaseMay 29, 2013; 11 years ago (2013-05-29)[1]
Stable release
18.3.1[2] Edit this on Wikidata / 26 April 2024; 2 months ago (26 April 2024)
Preview release
19.0- beta / April 25, 2024; 2 months ago (2024-04-25)[3]
Repository
Written inJavaScript
PlatformWeb platform
TypeJavaScript library
LicenseMIT License
Websitereact.dev Edit this on Wikidata

React (also known as React.js or ReactJS) is a free and open-source front-end JavaScript library[4][5] for building user interfaces based on components by Facebook Inc. It is maintained by Meta (formerly Facebook) and a community of individual developers and companies.[6][7][8]

React can be used to develop single-page, mobile, or server-rendered applications with frameworks like Next.js. Because React is only concerned with the user interface and rendering components to the DOM, React applications often rely on libraries for routing and other client-side functionality.[9][10] A key advantage of React is that it only rerenders those parts of the page that have changed, avoiding unnecessary rerendering of unchanged DOM elements.

Notable features

[edit]

Declarative

[edit]

React adheres to the declarative programming paradigm.[11]: 76  Developers design views for each state of an application, and React updates and renders components when data changes. This is in contrast with imperative programming.[12]

Components

[edit]

React code is made of entities called components.[11]: 10–12  These components are modular and reusable.[11]: 70  React applications typically consist of many layers of components. The components are rendered to a root element in the DOM using the React DOM library. When rendering a component, values are passed between components through props (short for "properties"). Values internal to a component are called its state.[13]

The two primary ways of declaring components in React are through function components and class components.[11]: 118 [14]: 10 

Function components

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Function components are declared with a function (using JavaScript function syntax or an arrow function expression) that accepts a single "props" argument and returns JSX. From React v16.8 onwards, function components can use state with the useState Hook.

React Hooks

[edit]

On February 16, 2019, React 16.8 was released to the public, introducing React Hooks.[15] Hooks are functions that let developers "hook into" React state and lifecycle features from function components.[16] Notably, Hooks do not work inside classes — they let developers use more features of React without classes.[17]

React provides several built-in hooks such as useState,[18][14]: 37  useContext,[11]: 11 [19][14]: 12  useReducer,[11]: 92 [19][14]: 65–66  useMemo[11]: 154 [19][14]: 162  and useEffect.[20][14]: 93–95  Others are documented in the Hooks API Reference.[21][11]: 62  useState and useEffect, which are the most commonly used, are for controlling state[11]: 37  and side effects,[11]: 61  respectively.

Rules of hooks

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There are two rules of hooks[22] which describe the characteristic code patterns that hooks rely on:

  1. "Only call hooks at the top level" — don't call hooks from inside loops, conditions, or nested statements so that the hooks are called in the same order each render.
  2. "Only call hooks from React functions" — don't call hooks from plain JavaScript functions so that stateful logic stays with the component.

Although these rules can't be enforced at runtime, code analysis tools such as linters can be configured to detect many mistakes during development. The rules apply to both usage of Hooks and the implementation of custom Hooks,[23] which may call other Hooks.

Server components

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React server components or "RSC"s[24] are function components that run exclusively on the server. The concept was first introduced in the talk Data Fetching with Server Components Though a similar concept to Server Side Rendering, RSCs do not send corresponding JavaScript to the client as no hydration occurs. As a result, they have no access to hooks. However, they may be asynchronous function, allowing them to directly perform asynchronous operations:

async function MyComponent() {
  const message = await fetchMessageFromDb();

  return (
    <div>Message: {message}</div>
  );
}

Currently, server components are most readily usable with Next.js.

Class components

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Class components are declared using ES6 classes. They behave the same way that function components do, but instead of using Hooks to manage state and lifecycle events, they use the lifecycle methods on the React.Component base class.

class ParentComponent extends React.Component {
  state = { color: 'green' };
  render() {
    return (
      <ChildComponent color={this.state.color} />
    );
  }
}

The introduction of React Hooks with React 16.8 in February 2019 allowed developers to manage state and lifecycle behaviors within functional components, reducing the reliance on class components.

This trend aligns with the broader industry movement towards functional programming and modular design. As React continues to evolve, it's essential for developers to consider the benefits of functional components and React Hooks when building new applications or refactoring existing ones.[25]

Routing

[edit]

React itself does not come with built-in support for routing. React is primarily a library for building user interfaces, and it doesn't include a full-fledged routing solution out of the box. Third-party libraries can be used to handle routing in React applications.[26] It allows the developer to define routes, manage navigation, and handle URL changes in a React-friendly way.

There is a Virtual DOM that is used to implement the real DOM

Virtual DOM

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Another notable feature is the use of a virtual Document Object Model, or Virtual DOM. React creates an in-memory data-structure cache, computes the resulting differences, and then updates the browser's displayed DOM efficiently.[27] This process is called reconciliation. This allows the programmer to write code as if the entire page is rendered on each change, while React only renders the components that actually change. This selective rendering provides a major performance boost.[28]

Updates

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When ReactDOM.render[29] is called again for the same component and target, React represents the new UI state in the Virtual DOM and determines which parts (if any) of the living DOM needs to change.[30]

Updates to realDOM are subject to virtualDOM
The virtualDOM will update the realDOM in real-time effortlessly

Lifecycle methods

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Lifecycle methods for class-based components use a form of hooking that allows the execution of code at set points during a component's lifetime.

  • ShouldComponentUpdate allows the developer to prevent unnecessary re-rendering of a component by returning false if a render is not required.
  • componentDidMount is called once the component has "mounted" (the component has been created in the user interface, often by associating it with a DOM node). This is commonly used to trigger data loading from a remote source via an API.
  • componentDidUpdate is invoked immediately after updating occurs.[31]
  • componentWillUnmount is called immediately before the component is torn down or "unmounted". This is commonly used to clear resource-demanding dependencies to the component that will not simply be removed with the unmounting of the component (e.g., removing any setInterval() instances that are related to the component, or an "eventListener" set on the "document" because of the presence of the component)
  • render is the most important lifecycle method and the only required one in any component. It is usually called every time the component's state is updated, which should be reflected in the user interface.

JSX

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JSX, or JavaScript XML, is an extension to the JavaScript language syntax.[32] Similar in appearance to HTML,[11]: 11  JSX provides a way to structure component rendering using syntax familiar[11]: 15  to many developers. React components are typically written using JSX, although they do not have to be (components may also be written in pure JavaScript). JSX is similar to another extension syntax created by Facebook for PHP called XHP.

An example of JSX code:

class App extends React.Component {
  render() {
    return (
      <div>
        <p>Header</p>
        <p>Content</p>
        <p>Footer</p>
      </div>
    );
  }
}

Architecture beyond HTML

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The basic architecture of React applies beyond rendering HTML in the browser. For example, Facebook has dynamic charts that render to <canvas> tags,[33] and Netflix and PayPal use universal loading to render identical HTML on both the server and client.[34][35]

Server-side rendering

[edit]

Server-side rendering (SSR) refers to the process of rendering a client-side JavaScript application on the server, rather than in the browser. This can improve the performance of the application, especially for users on slower connections or devices.

With SSR, the initial HTML that is sent to the client includes the fully rendered UI of the application. This allows the client's browser to display the UI immediately, rather than having to wait for the JavaScript to download and execute before rendering the UI.

React supports SSR, which allows developers to render React components on the server and send the resulting HTML to the client. This can be useful for improving the performance of the application, as well as for search engine optimization purposes.

Common idioms

[edit]

React does not attempt to provide a complete application library. It is designed specifically for building user interfaces[4] and therefore does not include many of the tools some developers might consider necessary to build an application. This allows the choice of whichever libraries the developer prefers to accomplish tasks such as performing network access or local data storage. Common patterns of usage have emerged as the library matures.

Unidirectional data flow

[edit]

To support React's concept of unidirectional data flow (which might be contrasted with AngularJS's bidirectional flow), the Flux architecture was developed as an alternative to the popular model–view–controller architecture. Flux features actions which are sent through a central dispatcher to a store, and changes to the store are propagated back to the view.[36] When used with React, this propagation is accomplished through component properties. Since its conception, Flux has been superseded by libraries such as Redux and MobX.[37]

Flux can be considered a variant of the observer pattern.[38]

A React component under the Flux architecture should not directly modify any props passed to it, but should be passed callback functions that create actions which are sent by the dispatcher to modify the store. The action is an object whose responsibility is to describe what has taken place: for example, an action describing one user "following" another might contain a user id, a target user id, and the type USER_FOLLOWED_ANOTHER_USER.[39] The stores, which can be thought of as models, can alter themselves in response to actions received from the dispatcher.

This pattern is sometimes expressed as "properties flow down, actions flow up". Many implementations of Flux have been created since its inception, perhaps the most well-known being Redux, which features a single store, often called a single source of truth.[40]

In February 2019, useReducer was introduced as a React hook in the 16.8 release. It provides an API that is consistent with Redux, enabling developers to create Redux-like stores that are local to component states.[41]

Future development

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Project status can be tracked via the core team discussion forum.[42] However, major changes to React go through the Future of React repository issues and pull requests.[43][44] This enables the React community to provide feedback on new potential features, experimental APIs and JavaScript syntax improvements.

History

[edit]

React was created by Jordan Walke, a software engineer at Meta, who initially developed a prototype called "F-Bolt"[45] before later renaming it to "FaxJS". This early version is documented in Jordan Walke's GitHub repository.[1] Influences for the project included XHP, an HTML component library for PHP.

React was first deployed on Facebook's News Feed in 2011 and subsequently integrated into Instagram in 2012 [citation needed]. In May 2013, at JSConf US, the project was officially open-sourced, marking a significant turning point in its adoption and growth.[2]

React Native, which enables native Android, iOS, and UWP development with React, was announced at Facebook's React Conf in February 2015 and open-sourced in March 2015.

On April 18, 2017, Facebook announced React Fiber, a new set of internal algorithms for rendering, as opposed to React's old rendering algorithm, Stack.[46] React Fiber was to become the foundation of any future improvements and feature development of the React library.[47][needs update] The actual syntax for programming with React does not change; only the way that the syntax is executed has changed.[48] React's old rendering system, Stack, was developed at a time when the focus of the system on dynamic change was not understood. Stack was slow to draw complex animation, for example, trying to accomplish all of it in one chunk. Fiber breaks down animation into segments that can be spread out over multiple frames. Likewise, the structure of a page can be broken into segments that may be maintained and updated separately. JavaScript functions and virtual DOM objects are called "fibers", and each can be operated and updated separately, allowing for smoother on-screen rendering.[49]

On September 26, 2017, React 16.0 was released to the public.[50]

On August 10, 2020, the React team announced the first release candidate for React v17.0, notable as the first major release without major changes to the React developer-facing API.[51]

On March 29, 2022, React 18 was released which introduced a new concurrent renderer, automatic batching and support for server side rendering with Suspense.[52]

Versions
Version Release Date Changes
0.3.0 29 May 2013 Initial Public Release
0.4.0 20 July 2013 Support for comment nodes <div>{/* */}</div>, Improved server-side rendering APIs, Removed React.autoBind, Support for the key prop, Improvements to forms, Fixed bugs.
0.5.0 20 October 2013 Improve Memory usage, Support for Selection and Composition events, Support for getInitialState and getDefaultProps in mixins, Added React.version and React.isValidClass, Improved compatibility for Windows.
0.8.0 20 December 2013 Added support for rows & cols, defer & async, loop for <audio> & <video>, autoCorrect attributes. Added onContextMenu events, Upgraded jstransform and esprima-fb tools, Upgraded browserify.
0.9.0 20 February 2014 Added support for crossOrigin, download and hrefLang, mediaGroup and muted, sandbox, seamless, and srcDoc, scope attributes, Added any, arrayOf, component, oneOfType, renderable, shape to React.PropTypes, Added support for onMouseOver and onMouseOut event, Added support for onLoad and onError on <img> elements.
0.10.0 21 March 2014 Added support for srcSet and textAnchor attributes, add update function for immutable data, Ensure all void elements don't insert a closing tag.
0.11.0 17 July 2014 Improved SVG support, Normalized e.view event, Update $apply command, Added support for namespaces, Added new transformWithDetails API, includes pre-built packages under dist/, MyComponent() now returns a descriptor, not an instance.
0.12.0 21 November 2014 Added new features Spread operator ({...}) introduced to deprecate this.transferPropsTo, Added support for acceptCharset, classID, manifest HTML attributes, React.addons.batchedUpdates added to API, @jsx React.DOM no longer required, Fixed issues with CSS Transitions.
0.13.0 10 March 2015 Deprecated patterns that warned in 0.12 no longer work, ref resolution order has changed, Removed properties this._pendingState and this._rootNodeID, Support ES6 classes, Added API React.findDOMNode(component), Support for iterators and immutable-js sequences, Added new features React.addons.createFragment, deprecated React.addons.classSet.
0.14.1 29 October 2015 Added support for srcLang, default, kind attributes, and color attribute, Ensured legacy .props access on DOM nodes, Fixed scryRenderedDOMComponentsWithClass, Added react-dom.js.
15.0.0 7 April 2016 Initial render now uses document.createElement instead of generating HTML, No more extra <span>s, Improved SVG support, ReactPerf.getLastMeasurements() is opaque, New deprecations introduced with a warning, Fixed multiple small memory leaks, React DOM now supports the cite and profile HTML attributes and cssFloat, gridRow and gridColumn CSS properties.
15.1.0 20 May 2016 Fix a batching bug, Ensure use of the latest object-assign, Fix regression, Remove use of merge utility, Renamed some modules.
15.2.0 1 July 2016 Include component stack information, Stop validating props at mount time, Add React.PropTypes.symbol, Add onLoad handling to <link> and onError handling to <source> element, Add isRunning() API, Fix performance regression.
15.3.0 30 July 2016 Add React.PureComponent, Fix issue with nested server rendering, Add xmlns, xmlnsXlink to support SVG attributes and referrerPolicy to HTML attributes, updates React Perf Add-on, Fixed issue with ref.
15.3.1 19 August 2016 Improve performance of development builds, Cleanup internal hooks, Upgrade fbjs, Improve startup time of React, Fix memory leak in server rendering, fix React Test Renderer, Change trackedTouchCount invariant into a console.error.
15.4.0 16 November 2016 React package and browser build no longer includes React DOM, Improved development performance, Fixed occasional test failures, update batchedUpdates API, React Perf, and ReactTestRenderer.create().
15.4.1 23 November 2016 Restructure variable assignment, Fixed event handling, Fixed compatibility of browser build with AMD environments.
15.4.2 6 January 2017 Fixed build issues, Added missing package dependencies, Improved error messages.
15.5.0 7 April 2017 Added react-dom/test-utils, Removed peerDependencies, Fixed issue with Closure Compiler, Added a deprecation warning for React.createClass and React.PropTypes, Fixed Chrome bug.
15.5.4 11 April 2017 Fix compatibility with Enzyme by exposing batchedUpdates on shallow renderer, Update version of prop-types, Fix react-addons-create-fragment package to include loose-envify transform.
15.6.0 13 June 2017 Add support for CSS variables in style attribute and Grid style properties, Fix AMD support for addons depending on react, Remove unnecessary dependency, Add a deprecation warning for React.createClass and React.DOM factory helpers.
16.0.0 26 September 2017 Improved error handling with introduction of "error boundaries", React DOM allows passing non-standard attributes, Minor changes to setState behavior, remove react-with-addons.js build, Add React.createClass as create-react-class, React.PropTypes as prop-types, React.DOM as react-dom-factories, changes to the behavior of scheduling and lifecycle methods.
16.1.0 9 November 2017 Discontinuing Bower Releases, Fix an accidental extra global variable in the UMD builds, Fix onMouseEnter and onMouseLeave firing, Fix <textarea> placeholder, Remove unused code, Add a missing package.json dependency, Add support for React DevTools.
16.3.0 29 March 2018 Add a new officially supported context API, Add new packagePrevent an infinite loop when attempting to render portals with SSR, Fix an issue with this.state, Fix an IE/Edge issue.
16.3.1 3 April 2018 Prefix private API, Fix performance regression and error handling bugs in development mode, Add peer dependency, Fix a false positive warning in IE11 when using Fragment.
16.3.2 16 April 2018 Fix an IE crash, Fix labels in User Timing measurements, Add a UMD build, Improve performance of unstable_observedBits API with nesting.
16.4.0 24 May 2018 Add support for Pointer Events specification, Add the ability to specify propTypes, Fix reading context, Fix the getDerivedStateFromProps() support, Fix a testInstance.parent crash, Add React.unstable_Profiler component for measuring performance, Change internal event names.
16.5.0 5 September 2018 Add support for React DevTools Profiler, Handle errors in more edge cases gracefully, Add react-dom/profiling, Add onAuxClick event for browsers, Add movementX and movementY fields to mouse events, Add tangentialPressure and twist fields to pointer event.
16.6.0 23 October 2018 Add support for contextType, Support priority levels, continuations, and wrapped callbacks, Improve the fallback mechanism, Fix gray overlay on iOS Safari, Add React.lazy() for code splitting components.
16.7.0 20 December 2018 Fix performance of React.lazy for lazily-loaded components, Clear fields on unmount to avoid memory leaks, Fix bug with SSR, Fix a performance regression.
16.8.0 6 February 2019 Add Hooks, Add ReactTestRenderer.act() and ReactTestUtils.act() for batching updates, Support synchronous thenables passed to React.lazy(), Improve useReducer Hook lazy initialization API.
16.8.6 27 March 2019 Fix an incorrect bailout in useReducer(), Fix iframe warnings in Safari DevTools, Warn if contextType is set to Context.Consumer instead of Context, Warn if contextType is set to invalid values.
16.9.0 9 August 2019 Add React.Profiler API for gathering performance measurements programmatically. Remove unstable_ConcurrentMode in favor of unstable_createRoot
16.10.0 27 September 2019 Fix edge case where a hook update wasn't being memoized. Fix heuristic for determining when to hydrate, so we don't incorrectly hydrate during an update. Clear additional fiber fields during unmount to save memory. Fix bug with required text fields in Firefox. Prefer Object.is instead of inline polyfill, when available. Fix bug when mixing Suspense and error handling.
16.10.1 28 September 2019 Fix regression in Next.js apps by allowing Suspense mismatch during hydration to silently proceed
16.10.2 3 October 2019 Fix regression in react-native-web by restoring order of arguments in event plugin extractors
16.11.0 22 October 2019 Fix mouseenter handlers from firing twice inside nested React containers. Remove unstable_createRoot and unstable_createSyncRoot experimental APIs. (These are available in the Experimental channel as createRoot and createSyncRoot.)
16.12.0 14 November 2019 React DOM - Fix passive effects (useEffect) not being fired in a multi-root app.

React Is - Fix lazy and memo types considered elements instead of components

16.13.0 26 February 2020 Features added in React Concurrent mode.

Fix regressions in React core library and React Dom.

16.13.1 19 March 2020 Fix bug in legacy mode Suspense.

Revert warning for cross-component updates that happen inside class render lifecycles

16.14.0 14 October 2020 Add support for the new JSX transform.
17.0.0 20 October 2020 "No New Features" enables gradual React updates from older versions.

Add new JSX Transform, Changes to Event Delegation

17.0.1 22 October 2020 React DOM - Fixes a crash in IE11
17.0.2 22 March 2021 React DOM - Remove an unused dependency to address the SharedArrayBuffer cross-origin isolation warning.
18.0.0 29 March 2022 Concurrent React, Automatic batching, New Suspense Features, Transitions, Client and Server Rendering APIs, New Strict Mode Behaviors, New Hooks [52]
18.1.0 26 April 2022 Many fixes and performance improvements
18.2.0 14 June 2022 Many more fixes and performance improvements

Licensing

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The initial public release of React in May 2013 used the Apache License 2.0. In October 2014, React 0.12.00 replaced this with the 3-clause BSD license and added a separate PATENTS text file that permits usage of any Facebook patents related to the software:[53]

The license granted hereunder will terminate, automatically and without notice, for anyone that makes any claim (including by filing any lawsuit, assertion or other action) alleging (a) direct, indirect, or contributory infringement or inducement to infringe any patent: (i) by Facebook or any of its subsidiaries or affiliates, whether or not such claim is related to the Software, (ii) by any party if such claim arises in whole or in part from any software, product or service of Facebook or any of its subsidiaries or affiliates, whether or not such claim is related to the Software, or (iii) by any party relating to the Software; or (b) that any right in any patent claim of Facebook is invalid or unenforceable.

This unconventional clause caused some controversy and debate in the React user community, because it could be interpreted to empower Facebook to revoke the license in many scenarios, for example, if Facebook sues the licensee prompting them to take "other action" by publishing the action on a blog or elsewhere. Many expressed concerns that Facebook could unfairly exploit the termination clause or that integrating React into a product might complicate a startup company's future acquisition.[54]

Based on community feedback, Facebook updated the patent grant in April 2015 to be less ambiguous and more permissive:[55]

The license granted hereunder will terminate, automatically and without notice, if you (or any of your subsidiaries, corporate affiliates or agents) initiate directly or indirectly, or take a direct financial interest in, any Patent Assertion: (i) against Facebook or any of its subsidiaries or corporate affiliates, (ii) against any party if such Patent Assertion arises in whole or in part from any software, technology, product or service of Facebook or any of its subsidiaries or corporate affiliates, or (iii) against any party relating to the Software. [...] A "Patent Assertion" is any lawsuit or other action alleging direct, indirect, or contributory infringement or inducement to infringe any patent, including a cross-claim or counterclaim.[56]

The Apache Software Foundation considered this licensing arrangement to be incompatible with its licensing policies, as it "passes along risk to downstream consumers of our software imbalanced in favor of the licensor, not the licensee, thereby violating our Apache legal policy of being a universal donor", and "are not a subset of those found in the [Apache License 2.0], and they cannot be sublicensed as [Apache License 2.0]".[57] In August 2017, Facebook dismissed the Apache Foundation's downstream concerns and refused to reconsider their license.[58][59] The following month, WordPress decided to switch its Gutenberg and Calypso projects away from React.[60]

On September 23, 2017, Facebook announced that the following week, it would re-license Flow, Jest, React, and Immutable.js under a standard MIT License; the company stated that React was "the foundation of a broad ecosystem of open source software for the web", and that they did not want to "hold back forward progress for nontechnical reasons".[61]

On September 26, 2017, React 16.0.0 was released with the MIT license.[62] The MIT license change has also been backported to the 15.x release line with React 15.6.2.[63]

See also

[edit]

References

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