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| name = React
| logo = React Logo SVG.svg
| logo size = 130px
| author = Jordan Walke
| developer = [[Meta Platforms|Meta]] and community
| released = {{Start date and age|2013|5|29}}<ref name="Occhino-2013">{{cite web|access-date=22 Oct 2018|first1=Tom|first2=Jordan|last1=Occhino|last2=Walke|title=JS Apps at Facebook|url=https://www.youtube.com/watch?v=GW0rj4sNH2w|website=YouTube|date=5 August 2013 |archive-date=31 May 2022|archive-url=https://web.archive.org/web/20220531133559/https://www.youtube.com/watch?v=GW0rj4sNH2w|url-status=live}}</ref><ref>{{Cite web |date=2021-04-12 |title=Is React a Library or a Framework? Here's Why it Matters |url=https://www.freecodecamp.org/news/is-react-a-library-or-a-framework/ |access-date=2024-10-12 |website=freeCodeCamp.org |language=en}}</ref>
| ver layout = stacked
| latest release version = {{wikidata|property|reference|edit|P348}}
Line 17 ⟶ 18:
{{wikidata|qualifier|P348|P577}}
}}
| latest preview version = 19.0.0-rc.01
| latest preview date = {{Start date and age|2024|0611|0314}}<ref name="customelements">{{cite web|url=https://react.dev/blog/2024/04/25/react-19#whats-new-in-react-19|title=What's new in React 19|access-date=2024-05-12|archive-date=2024-05-12|archive-url=https://web.archive.org/web/20240512195006/https://react.dev/blog/2024/04/25/react-19#whats-new-in-react-19|url-status=live}}</ref>
| programming language = [[JavaScript]]
| platform = [[Web platform]]
| genre = [[JavaScript library]]
| license = [[MIT License]]
| website = https://react.dev/
}}
 
'''React''' (also known as '''React.js''' or '''ReactJS''') is a [[free and open-source software|free and open-source]] [[frontend and backend|front-end]] [[JavaScript library]]<ref name="reactjs.org-3">{{Cite web |title=React – A JavaScript library for building user interfaces. |url=https://reactjs.org |url-status=live |access-date=7 April 2018 |website=reactjs.org |language=en-US |archive-date=April 8, 2018 |archive-url=https://web.archive.org/web/20180408084010/https://reactjs.org/ }}</ref><ref>{{Cite web |title=Chapter 1. What Is React? - What React Is and Why It Matters [Book] |url=https://www.oreilly.com/library/view/what-react-is/9781491996744/ch01.html |url-status=live |access-date=2023-05-06 |website=www.oreilly.com |language=en |archive-date=May 6, 2023 |archive-url=https://web.archive.org/web/20230506100446/https://www.oreilly.com/library/view/what-react-is/9781491996744/ch01.html }}</ref> forthat aims to make building [[user interface]]s based on [[component-based software engineering|components]] bymore [[Facebook"seamless".<ref Inc]]name="reactjs.org-3" /> It is maintained by [[Meta Platforms|Meta]] (formerly Facebook) and a community of individual developers and companies.<ref>{{cite web |last=Krill |first=Paul |date=May 15, 2014 |title=React: Making faster, smoother UIs for data-driven Web apps |url=https://www.infoworld.com/article/2608181/javascript/react--making-faster--smoother-uis-for-data-driven-web-apps.html |access-date=2021-02-23 |website=[[InfoWorld]] |archive-date=2018-06-12 |archive-url=https://web.archive.org/web/20180612141516/https://www.infoworld.com/article/2608181/javascript/react--making-faster--smoother-uis-for-data-driven-web-apps.html |url-status=live }}</ref><ref>{{cite web |last=Hemel |first=Zef |date=June 3, 2013 |title=Facebook's React JavaScript User Interfaces Library Receives Mixed Reviews |url=https://www.infoq.com/news/2013/06/facebook-react |url-status=live |access-date=2022-01-11 |website=infoq.com |language=en-US |archive-url=https://web.archive.org/web/20220526082114/https://www.infoq.com/news/2013/06/facebook-react/ |archive-date=May 26, 2022}}</ref><ref>{{cite web |last=Dawson |first=Chris |date=July 25, 2014 |title=JavaScript's History and How it Led To ReactJS |url=https://thenewstack.io/javascripts-history-and-how-it-led-to-reactjs/ |url-status=live |access-date=2020-07-19 |website=The New Stack |language=en-US |archive-url=https://web.archive.org/web/20200806190027/https://thenewstack.io/javascripts-history-and-how-it-led-to-reactjs/ |archive-date=Aug 6, 2020 }}</ref>
 
React can be used to develop [[single-page application|single-page]], mobile, or [[server-side rendering|server-rendered]] applications with frameworks like [[Next.js]] and [[Remix (web framework)|Remix]]{{Efn|Merged into [[React Router]] since React Router v7<ref>{{Cite web |last=Lybrand |first=Brooks |date=2024-05-15 |title=Merging Remix and React Router |url=https://remix.run/blog/merging-remix-and-react-router |access-date=2024-12-25 |website=remix.run |language=en}}</ref>}}. Because React is only concerned with the user interface and rendering components to the [[Document Object Model|DOM]], React applications often rely on [[JavaScript libraries|libraries]] for routing and other client-side functionality.{{sfn|Dere|2017}}{{sfn|Panchal|2022}} A key advantage of React is that it only rerendersre-renders those parts of the page that have changed, avoiding unnecessary re-rendering of unchanged DOM elements. It was first launched on 29 May 2013.<ref>{{Cite web |date=2021-04-12 |title=Is React a Library or a Framework? Here's Why it Matters |url=https://www.freecodecamp.org/news/is-react-a-library-or-a-framework/ |access-date=2024-10-12 |website=freeCodeCamp.org |language=en}}</ref>
 
== Notable features ==
=== Declarative ===
React adheres to the [[declarative programming]] [[Programming paradigm|paradigm]].<ref>{{Cite web |date=2017-09-27 |title=React Introduction |url=https://www.geeksforgeeks.org/reactjs-introduction/ |access-date=2024-10-12 |website=GeeksforGeeks |language=en-US}}</ref>React adheres to the [[declarative programming]] [[Programming paradigm|paradigm]].{{sfn|Wieruch|2020}}{{rp|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]].{{sfn|Schwarzmüller|2018}}
 
=== Components ===
React code is made of entities called [[Component-based software engineering|components]].{{sfn|Wieruch|2020}}{{rp|10-12}} These components are modular and reusablecan be reused.{{sfn|Wieruch|2020}}{{rp|70}} React applications typically consist of many layers of components. The components are rendered to a root element in the [[Document Object Model|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.''<ref>{{cite web |title=Components and Props |url=https://reactjs.org/docs/components-and-props.html#props-are-read-only |url-status=live |access-date=7 April 2018 |website=React |publisher=Facebook |archive-date=7 April 2018 |archive-url=https://web.archive.org/web/20180407120115/https://reactjs.org/docs/components-and-props.html}}</ref>
 
The two primary ways of declaring components in React are through function components and class components.{{sfn|Wieruch|2020}}{{rp|118}}{{sfn|Larsen|2021}}{{rp|10}} Since React v16.8, using function components is the recommended way.
 
=== Function components ===
Function components, areannounced declaredat withReact aConf function2018, (usingand JavaScriptavailable functionsince syntaxReact orv16.8, anare [[Anonymousdeclared function|arrowwith a function expression]]) that accepts a single "props" argument and returns JSX. From React v16.8 onwards, functionFunction components can use internal state with the <code>useState</code> Hook.
<ref name="introducing_hooks"/>
 
=== React Hooks ===
On February 16, 2019, React 16.8 was released to the public, introducing React Hooks.<ref name="introducing_hooks">{{cite web
|url=https://reactjs.org/docs/hooks-intro.html
|title=Introducing Hooks
Line 50 ⟶ 53:
|archive-url=https://web.archive.org/web/20181025163202/https://reactjs.org/docs/hooks-intro.html
|url-status=live
}}</ref> Hooks are functions that let developers "hook into" React state and lifecycle features from function components.<ref>{{Cite web|url=https://reactjs.org/docs/hooks-overview.html|title=Hooks at a Glance – React|website=reactjs.org|language=en|access-date=2019-08-08|archive-date=2023-03-15|archive-url=https://web.archive.org/web/20230315054047/https://reactjs.org/docs/hooks-overview.html|url-status=live}}</ref> Notably, Hooks do not work inside classes — they let developers use more features of React without classes.<ref>{{Cite web |urldate=https://blog.soshace.com/what2020-the01-heck-is-react-hooks/16 |title=What the Heck is React Hooks? |dateurl=https://soshace.com/2020-/01-/16|website=Soshace|language=en|access/what-date=2020the-01heck-24|archiveis-date=2022react-05hooks/ |url-31status=live |archive-url=https://web.archive.org/web/20220531133601/https://blog.soshace.com/what-the-heck-is-react-hooks/ |urlarchive-statusdate=live2022-05-31 |access-date=2020-01-24 |website=Soshace |language=en}}</ref>
 
React provides several built-in hooks such as <code>useState</code>,<ref>{{Cite web|url=https://reactjs.org/docs/hooks-state.html|title=Using the State Hook – React|website=reactjs.org|language=en|access-date=2020-01-24|archive-date=2022-07-30|archive-url=https://web.archive.org/web/20220730180312/https://reactjs.org/docs/hooks-state.html|url-status=live}}</ref>{{sfn|Larsen|2021}}{{rp|37}} <code>useContext</code>,{{sfn|Wieruch|2020}}{{rp|11}}<ref name="reactjs.org-2">{{Cite web|url=https://reactjs.org/docs/hooks-state.html|title=Using the State Hook – React|website=reactjs.org|language=en|access-date=2020-01-24|archive-date=2022-07-30|archive-url=https://web.archive.org/web/20220730180312/https://reactjs.org/docs/hooks-state.html|url-status=live}}</ref>{{sfn|Larsen|2021}}{{rp|12}} <code>useReducer</code>,{{sfn|Wieruch|2020}}{{rp|92}}<ref name="reactjs.org-2" />{{sfn|Larsen|2021}}{{rp|65-66}} <code>useMemo</code>{{sfn|Wieruch|2020}}{{rp|154}}<ref name="reactjs.org-2" />{{sfn|Larsen|2021}}{{rp|162}} and <code>useEffect</code>.<ref>{{Cite web|url=https://reactjs.org/docs/hooks-effect.html|title=Using the Effect Hook – React|website=reactjs.org|language=en|access-date=2020-01-24|archive-date=2022-08-01|archive-url=https://web.archive.org/web/20220801212858/https://reactjs.org/docs/hooks-effect.html|url-status=live}}</ref>{{sfn|Larsen|2021}}{{rp|93-95}} Others are documented in the Hooks API Reference.<ref>{{Cite web|url=https://reactjs.org/docs/hooks-reference.html|title=Hooks API Reference – React|website=reactjs.org|language=en|access-date=2020-01-24|archive-date=2022-08-05|archive-url=https://web.archive.org/web/20220805061010/https://reactjs.org/docs/hooks-reference.html|url-status=live}}</ref>{{sfn|Wieruch|2020}}{{rp|62}} <code>useState</code> and <code>useEffect</code>, which are the most commonly used, are for controlling [[State (computer science)|state]]{{sfn|Wieruch|2020}}{{rp|37}} and [[Side effect (computer science)|side effects]],{{sfn|Wieruch|2020}}{{rp|61}} respectively.
 
==== Rules of hooks ====
Line 63 ⟶ 66:
 
=== Server components ===
React server components (RSC) <ref>{{Cite web|url=https://react.dev/blog/2023/03/22/react-labs-what-we-have-been-working-on-march-2023#react-server-components|title=React Labs: What We've Been Working On – March 2023|website=react.dev|language=en|access-date=2023-07-23|archive-date=2023-07-26|archive-url=https://web.archive.org/web/20230726201006/https://react.dev/blog/2023/03/22/react-labs-what-we-have-been-working-on-march-2023#react-server-components|url-status=live}}</ref> are function components that run exclusively on the server. The concept was first introduced in the talk "Data Fetching with Server Components".<ref>{{Cite web |lastlast1=Abramov |firstfirst1=Dan |last2=Tan |first2=Lauren |last3=Savona |first3=Joseph |last4=Markbåge |first4=Sebastian |date=2020-12-21 |title=Introducing Zero-Bundle-Size React Server Components |url=https://react.dev/blog/2020/12/21/data-fetching-with-react-server-components |access-date=2024-09-28 |website=react.dev |language=en}}</ref> 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 [[Async/await|asynchronous function]], allowing them to directly perform asynchronous operations:
 
<syntaxhighlight lang="jsx" line="1">
Line 75 ⟶ 78:
</syntaxhighlight>
 
Currently, server components are most readily usable with [[Next.js]]. With Next.js, it's possible to write components for both the server and the client (browser). When a server rendered component is received by the browser, React in the browser takes over and creates the virtual DOM and attach event handlers. This is called hydration.
<ref>{{Cite web |title= hydrate |url=https://18.react.dev/reference/react-dom/hydrate#hydrating-server-rendered-html |access-date=2025-06-19 |language=en |archive-url=https://web.archive.org/web/20240716002720/https://18.react.dev/reference/react-dom/hydrate#hydrating-server-rendered-html |archive-date=2024-07-16 |url-status=live }}</ref>
 
=== Class components ===
Line 98 ⟶ 102:
 
=== Virtual DOM ===
Another notable feature is the use of a virtual [[Document Object Model]], or [[Virtual DOM]]. React creates an [[In-memory processing|in-memory]] data-structure cache, computessimilar to the resultingbrowser differencesDOM. Every time components are rendered, andthe result is compared with the virtual DOM. It then updates the browser's displayed DOM efficiently with only the computed differences.<ref name="React Blog">{{cite web |title=Refs and the DOM |url=https://reactjs.org/docs/refs-and-the-dom.html |access-date=2021-07-19 |website=React Blog |archive-date=2022-08-07 |archive-url=https://web.archive.org/web/20220807171328/https://reactjs.org/docs/refs-and-the-dom.html |url-status=live }}</ref> 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.<ref name="Codecademy">{{Cite web |title=React: The Virtual DOM |url=https://www.codecademy.com/articles/react-virtual-dom |access-date=2021-10-14 |website=Codecademy |language=en |archive-date=2021-10-28 |archive-url=https://web.archive.org/web/20211028172953/https://www.codecademy.com/articles/react-virtual-dom |url-status=live }}</ref><ref name="Aggarwal">{{cite web |last1=Aggarwal |first1=Sanchit |title=Modern Web-Development using ReactJS |url=https://ijrra.net/Vol5issue1/IJRRA-05-01-27.pdf |website=International Journal of Recent Research Aspects |access-date=11 December 2024 |archive-url=https://web.archive.org/web/20240417143754/https://ijrra.net/Vol5issue1/IJRRA-05-01-27.pdf |archive-date=17 April 2024 |pages=133–137 |date=March 2018 |url-status=live}}</ref>
 
==== Updates ====
When <code>ReactDOM.render</code><ref>{{Cite web |title=ReactDOM – React |url=https://reactjs.org/docs/react-dom.html |access-date=2023-01-08 |website=reactjs.org |language=en |archive-date=2023-01-08 |archive-url=https://web.archive.org/web/20230108104936/https://reactjs.org/docs/react-dom.html |url-status=live }}</ref> 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.<ref>{{Cite web |title=Reconciliation – React |url=https://reactjs.org/docs/reconciliation.html |access-date=2023-01-08 |website=reactjs.org |language=en |archive-date=2023-01-08 |archive-url=https://web.archive.org/web/20230108105122/https://reactjs.org/docs/reconciliation.html |url-status=live }}</ref>
 
Line 115 ⟶ 119:
=== JSX ===
{{Main|JSX (JavaScript)|l1=JSX}}
[[JSX (JavaScript)|JSX]], or JavaScript XML, is an extension to the JavaScript language syntax.<ref>{{cite web |date=2022-03-08 |title=Draft: JSX Specification |url=https://facebook.github.io/jsx/ |access-date=7 April 2018 |website=JSX |publisher=Facebook |language=en-US |archive-date=2022-04-02 |archive-url=https://web.archive.org/web/20220402072504/https://facebook.github.io/jsx/ |url-status=live }}</ref> Similar in appearance to HTML,{{sfn|Wieruch|2020}}{{rp|11}} JSX provides a way to structure component rendering using syntax familiar{{sfn|Wieruch|2020}}{{rp|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). During compilation, JSX is converted to JavaScript code. JSX is similar to another extension syntax created by Facebook for [[PHP]] called [[XHP]].
 
An example of JSX code:
<syntaxhighlight lang="jsx">
function Example() {
class App extends React.Component {
// Declare a new state variable, which we'll call "count"
render() {
const [count, setCount] = useState(0);
return (
 
<div>
return (
<p>Header</p>
<p>Content</pdiv>
<p>FooterYou clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
</div>
); Click me
</button>
}
</div>
);
}
</syntaxhighlight>
 
=== Architecture beyond HTML ===
The basic [[Software architecture|architecture]] of React applies beyond rendering HTML in the browser. For example, Facebook has dynamic charts that render to <code><nowiki><canvas></nowiki></code> tags,<ref>{{cite web |last=Hunt |first=Pete |date=2013-06-05 |title=Why did we build React? – React Blog |url=https://facebook.github.io/react/blog/2013/06/05/why-react.html |access-date=2022-02-17 |website=reactjs.org |language=en-US |archive-date=2015-04-06 |archive-url=https://web.archive.org/web/20150406072833/http://facebook.github.io/react/blog/2013/06/05/why-react.html |url-status=dead }}</ref> and Netflix and [[PayPal]] use universal loading to render identical HTML on both the server and client.<ref name="medium.com-2015">{{cite web |date=2015-04-27 |title=PayPal Isomorphic React |url=https://medium.com/paypal-engineering/isomorphic-react-apps-with-react-engine-17dae662379c |url-status=live |archive-url=https://web.archive.org/web/20190208124143/https://www.paypal-engineering.com/2015/04/27/isomorphic-react-apps-with-react-engine/ |archive-date=2019-02-08 |access-date=2019-02-08 |website=medium.com}}</ref><ref name="netflixtechblog.com-2015">{{cite web |date=2015-01-28 |title=Netflix Isomorphic React |url=http://techblog.netflix.com/2015/01/netflix-likes-react.html |access-date=2022-02-14 |website=netflixtechblog.com |language=en-US |archive-date=2016-12-17 |archive-url=https://web.archive.org/web/20161217043150/http://techblog.netflix.com/2015/01/netflix-likes-react.html |url-status=live }}</ref> React can also be used to develop native apps for Android and iOS using [[React Native]].
 
=== Server-side rendering ===
[[Server-side scripting|Server-side rendering]] (SSR) refers to the process of rendering a client-side JavaScript application on the server, rather than in the browser.<ref name="MDNSSR">
{{Unreferenced section|date=May 2024}}
{{cite web
[[Server-side scripting|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.
|title=Server-side rendering (SSR) - MDN Web Docs Glossary
|url=https://developer.mozilla.org/en-US/docs/Glossary/SSR
|website=MDN Web Docs
|publisher=Mozilla
|access-date=7 March 2025
}}
</ref> This can improve the performance of the application, especially for users on slower connections or devices.<ref name="GoogleRendering">
{{cite web
|title=Rendering on the Web
|url=https://web.dev/rendering-on-the-web/
|website=web.dev
|publisher=Google
|date=6 February 2019
|access-date=7 March 2025
}}
</ref>
 
With SSR, the initial HTML that is sent to the client includes the fully rendered UI of the application.<ref 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.name="CSS-Tricks-SSR">
{{cite web
|last=Jain
|first=Atishay
|title=Render Caching for React
|url=https://css-tricks.com/render-caching-for-react/
|website=CSS-Tricks
|date=10 November 2018
|access-date=7 March 2025
}}
</ref> 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.<ref name="CSS-Tricks-SSR" />
 
React supports SSR, which allows developers to render React components on the server and send the resulting HTML to the client.<ref This can be useful for improving the performance of the application, as well as for [[search engine optimization]] purposes.name="ReactDoc">
{{cite web
|title=Server React DOM APIs
|url=https://react.dev/reference/react-dom/server
|website=React Documentation
|publisher=Meta Platforms
|access-date=7 March 2025
}}
</ref> This can be useful for improving the performance of the application, as well as for [[search engine optimization]] purposes.<ref name="NextDocs">
{{cite web
|title=Rendering (Next.js Documentation)
|url=https://nextjs.org/docs/pages/building-your-application/rendering
|website=Next.js Documentation
|publisher=Vercel
|access-date=7 March 2025
}}
</ref>
 
== Common idioms ==
Line 147 ⟶ 195:
 
=== Unidirectional data flow ===
{{Main|Unidirectional data flow}}
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.<ref name="Flux">{{cite web|url=https://facebook.github.io/flux/docs/in-depth-overview|title=In Depth OverView|publisher=Facebook|access-date=7 April 2018|website=Flux|archive-date=7 August 2022|archive-url=https://web.archive.org/web/20220807201252/https://facebook.github.io/flux/docs/in-depth-overview/|url-status=dead}}</ref> When used with React, this propagation is accomplished through component properties. Since its conception, Flux has been superseded by libraries such as [[Redux (JavaScript library)|Redux]] and MobX.<ref>{{cite web|title=Flux Release 4.0|url=https://github.com/facebook/flux/releases/tag/4.0.0|website=Github|access-date=26 February 2021|archive-date=31 May 2022|archive-url=https://web.archive.org/web/20220531133558/https://github.com/facebook/flux/releases/tag/4.0.0|url-status=live}}</ref>
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.<ref name="Flux">{{cite web|url=https://facebook.github.io/flux/docs/in-depth-overview|title=In Depth OverView|publisher=Facebook|access-date=7 April 2018|website=Flux|archive-date=7 August 2022|archive-url=https://web.archive.org/web/20220807201252/https://facebook.github.io/flux/docs/in-depth-overview/|url-status=dead}}</ref> When used with React, this propagation is accomplished through component properties. Since its conception, Flux has been superseded by libraries such as [[Redux (JavaScript library)|Redux]] and MobX.<ref>{{cite web|title=Flux Release 4.0|url=https://github.com/facebook/flux/releases/tag/4.0.0|website=Github|access-date=26 February 2021|archive-date=31 May 2022|archive-url=https://web.archive.org/web/20220531133558/https://github.com/facebook/flux/releases/tag/4.0.0|url-status=live}}</ref>
 
Flux can be considered a variant of the [[observer pattern]].<ref>{{cite web|last1=Johnson|first1=Nicholas|title=Introduction to Flux – React Exercise|url=http://nicholasjohnson.com/react/course/exercises/flux/|website=Nicholas Johnson|access-date=7 April 2018|archive-date=31 May 2022|archive-url=https://web.archive.org/web/20220531133600/http://nicholasjohnson.com/react/course/exercises/flux/|url-status=live}}</ref>
Line 155 ⟶ 204:
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 (JavaScript library)|Redux]], which features a single store, often called a [[single source of truth]].<ref>{{cite web|title=State Management Tools – Results|url=http://2016.stateofjs.com/2016/statemanagement/|website=The State of JavaScript|access-date=29 October 2021|archive-date=31 May 2022|archive-url=https://web.archive.org/web/20220531133609/http://2016.stateofjs.com/2016/statemanagement/|url-status=live}}</ref>
 
In February 2019, <code>useReducer</code> was introduced as a [[React (web framework)#React Hooks|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.<ref>{{Cite web |url=https://reactjs.org/blog/2019/02/06/react-v16.8.0.html#react-1 |title=React v16.8: The One with Hooks |access-date=2023-01-08 |archive-date=2023-01-08 |archive-url=https://web.archive.org/web/20230108090021/https://reactjs.org/blog/2019/02/06/react-v16.8.0.html#react-1 |url-status=live }}</ref>
 
== Future development ==
Project status can be tracked via the core team discussion forum.<ref>{{Cite web|title = Meeting Notes|url = https://discuss.reactjs.org/c/meeting-notes|website = React Discuss|access-date = 2015-12-13|archive-date = 2015-12-22|archive-url = https://web.archive.org/web/20151222141426/https://discuss.reactjs.org/c/meeting-notes|url-status = dead}}</ref> However, major changes to React go through the Future of React repository issues and [[pull request]]s.<ref>{{Cite web|title = reactjs/react-future – The Future of React|url = https://github.com/reactjs/react-future|website = GitHub|access-date = 2015-12-13|archive-date = 2022-07-13|archive-url = https://web.archive.org/web/20220713230021/https://github.com/reactjs/react-future|url-status = live}}</ref><ref>{{Cite web|title = facebook/react – Feature request issues|url = https://github.com/facebook/react/labels/Type:%20Feature%20Request|website = GitHub|access-date = 2015-12-13|archive-date = 2022-07-09|archive-url = https://web.archive.org/web/20220709131412/https://github.com/facebook/react/labels/Type%3A%20Feature%20Request|url-status = live}}</ref> This enables the React community to provide feedback on new potential features, experimental APIs and JavaScript syntax improvements.
 
== History ==
React was created by Jordan Walke, a software engineer at [[Meta Platforms|Meta]], who initially developed a prototype called "F-Bolt"<ref name="Youtube-2023">{{cite web |title=React.js: The Documentary |url=https://youtube.com/watch?v=8pDqJVdNa44%3Fsi%3DFMJqegC4dPtwKP__&t=528 |website=Youtube | date=10 February 2023 |publisher=Honeypot |access-date=2024-05-27 |archive-date=2024-01-19 |archive-url=https://web.archive.org/web/20240119211307/https://www.youtube.com/watch?v=8pDqJVdNa44%3Fsi%3DFMJqegC4dPtwKP__&t=528 |url-status=live }}</ref> before later renaming it to "FaxJS". This early version is documented in Jordan Walke's GitHub repository.{{ref|Walke, Jordan. "FaxJS." GitHub. https://github.com/jordwalke/FaxJs. Accessed 11 July 2019.}} 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.<ref name="Lopez">{{Citationcite web needed|last1=Lopez |first1=Marny |title=Why React is so widely adopted by web developers? |url=https://www.devlane.com/blog/why-react-is-so-widely-adopted-by-web-developers |website=Devlane |access-date=February11 December 2024 |archive-url=https://web.archive.org/web/20240620092857/https://www.devlane.com/blog/why-react-is-so-widely-adopted-by-web-developers |archive-date=20 June 2024 |date=13 May 2024 |url-status=live}}.</ref> In May 2013, at JSConf US, the project was officially open-sourced, marking a significant turning point in its adoption and growth.{{ref|Hámori, Emergent. "React – The Pragmatic Guide." 2022.}}
 
[[React Native]], which enables native [[Android (operating system)|Android]], [[iOS]], and [[Universal Windows Platform|UWP]] development with React, was announced at Facebook's React Conf in February 2015 and open-sourced in March 2015.
Line 180 ⟶ 226:
}}</ref>
 
On AugustOctober 1020, 2020, the React team announced the first release candidate forreleased React v17.0, notable as the first major release without major changes to the React developer-facing API.<ref>url=https://reactjs.org/blog/2020/08/10/react-v17-rc.html {{Webarchive|url=https://web.archive.org/web/20200810215037/https://reactjs.org/blog/2020/08/10/react-v17-rc.html |date=2020-08-10 }}</ref>
 
On March 29, 2022, React 18 was released which introduced a new concurrent renderer, automatic batching and support for server side rendering with Suspense.<ref>{{cite web |title=React 18 |url=https://react.dev/blog/2022/03/29/react-v18 |website=React |access-date=7 December 2024}}</ref>
 
On December 5, 2024, React 19 was released. This release introduced Actions, which simplify the process of making state updates using asynchronous functions rather than having to manually handle pending states, errors and optimistic updates. React 19 also included support for server components and improved static site generation.<ref>{{cite web |title=React 19 |url=https://react.dev/blog/2024/12/05/react-19#whats-new-in-react-19 |website=React |access-date=7 December 2024}}</ref>
On March 29, 2022, React 18 was released which introduced a new concurrent renderer, automatic batching and support for server side rendering with Suspense.<ref name="reactjs.org" />
 
{| class="wikitable mw-collapsible mw-collapsed"
Line 226 ⟶ 274:
|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
Line 246 ⟶ 290:
|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 {{code|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
Line 286 ⟶ 314:
|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
Line 314 ⟶ 334:
|6 February 2019
|Add Hooks, Add {{code|ReactTestRenderer.act()}} and {{code|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
Line 326 ⟶ 342:
|27 September 2019
|Fix edge case where a hook update was not being memoized. Fix heuristic for determining when to hydrate, so we do not 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
Line 346 ⟶ 354:
|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
Line 358 ⟶ 362:
|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 <code>SharedArrayBuffer</code> cross-origin isolation warning.
|-
|18.0.0
Line 383 ⟶ 379:
|Adds deprecation warnings for features in React 19.
|-
|1819.30.10
|265 AprilDecember 2024
|Many more fixes and performance improvements
|-
|19.0.0-rc.0
|3 June 2024
|Actions, new hooks (useActionState, useFormStatus, useOptimistic), use API, Server Components, Server Actions, passing ref as a normal prop, improved hydration diffs, improved Context API, cleanup functions for refs, improved useDeferredValue API, support for document metadata, support for stylesheets, support for async scripts, support for preloading resources, improved error reporting, and support for custom elements.
|}
Line 404 ⟶ 396:
 
On September 26, 2017, React 16.0.0 was released with the MIT license.<ref>{{cite web |url=https://reactjs.org/blog/2017/09/26/react-v16.0.html#mit-licensed |title=React v16.0§MIT licensed |last=Clark |first=Andrew |date=September 26, 2017 |website=React Blog |access-date=October 18, 2017 |archive-date=October 3, 2017 |archive-url=https://web.archive.org/web/20171003031315/https://reactjs.org/blog/2017/09/26/react-v16.0.html#mit-licensed |url-status=live }}</ref> The MIT license change has also been backported to the 15.x release line with React 15.6.2.<ref>{{cite web |url=https://reactjs.org/blog/2017/09/25/react-v15.6.2.html |title=React v15.6.2 |last=Hunzaker |first=Nathan |date=September 25, 2017 |website=React Blog |access-date=October 18, 2017 |archive-date=May 31, 2022 |archive-url=https://web.archive.org/web/20220531133328/https://reactjs.org/blog/2017/09/25/react-v15.6.2.html |url-status=live }}</ref>
 
== Comparison with other frameworks ==
JavaScript-based web application frameworks, such as React, provide extensive capabilities but come with associated trade-offs. These frameworks often extend or enhance features available through native web technologies, such as routing, component-based development, and state management. While native web standards, including Web Components, modern JavaScript APIs like Fetch and ES Modules, and browser capabilities like Shadow DOM, have advanced significantly, frameworks remain widely used for their ability to enhance developer productivity, offer structured patterns for large-scale applications, simplify handling edge cases, and provide tools for performance optimization. <ref name=":02">{{Cite book |title=JavaScript Frameworks for Modern Web Development: The Essential Frameworks, Libraries, and Tools to Learn Right Now |isbn=978-1484249949 |last1=Uzayr |first1=Sufyan bin |last2=Cloud |first2=Nicholas |last3=Ambler |first3=Tim |date=November 2019 |publisher=Apress }}</ref><ref name=":12">{{Cite book |title=Building Native Web Components: Front-End Development with Polymer and Vue.js |isbn=978-1484259047}}</ref><ref name=":22">{{Cite book |title=Hands-On JavaScript High Performance: Build faster web apps using Node.js, Svelte.js, and WebAssembly |isbn=978-1838821098}}</ref>
 
Frameworks can introduce abstraction layers that may contribute to performance overhead, larger bundle sizes, and increased complexity. Modern frameworks, such as React 18, address these challenges with features like concurrent rendering, tree-shaking, and selective hydration. While these advancements improve rendering efficiency and resource management, their benefits depend on the specific application and implementation context. Lightweight frameworks, such as Svelte and Preact, take different architectural approaches, with Svelte eliminating the virtual DOM entirely in favor of compiling components to efficient JavaScript code, and Preact offering a minimal, compatible alternative to React. Framework choice depends on an application’s requirements, including the team’s expertise, performance goals, and development priorities. <ref name=":02" /><ref name=":12" /><ref name=":22" />
 
A newer category of web frameworks, including enhance.dev, Astro, and Fresh, leverages native web standards while minimizing abstractions and development tooling. <ref>{{Cite web |title=Enhance |website=[[GitHub]] |url=https://github.com/enhance-dev }}</ref><ref>{{Cite web |title=Astro framework |website=[[GitHub]] |url=https://github.com/withastro/astro }}</ref><ref>{{Cite web |title=Fresh |website=[[GitHub]] |url=https://github.com/denoland/fresh }}</ref> These solutions emphasize [[progressive enhancement]], [[server-side rendering]], and optimizing performance. Astro renders static HTML by default while hydrating only interactive parts. Fresh focuses on server-side rendering with zero runtime overhead. Enhance.dev prioritizes progressive enhancement patterns using Web Components. While these tools reduce reliance on client-side JavaScript by shifting logic to build-time or server-side execution, they still use JavaScript where necessary for interactivity. This approach makes them particularly suitable for performance-critical and content-focused applications. <ref name=":02" /><ref name=":12" /><ref name=":22" />
 
== See also ==
Line 417 ⟶ 416:
* [[Comparison of JavaScript-based web frameworks]]
* [[Web Components]]
 
* [https://www.bhuwanchettri.com/2024/10/react%2019.html React 19]
== Notes ==
{{Notelist}}
 
== References ==
Line 427 ⟶ 428:
* {{cite book |last1=Schwarzmüller |first1=Max |date=2018-05-01 |title=React – The Complete Guide (incl. Hooks, React Router and Redux) |publisher=[[Packt Publishing]] |language=en-US}}
* {{cite book |last=Wieruch |first=Robin |title=The Road to React |publisher=Leanpub |isbn=978-1-72004-399-7 |year=2020}}
* {{cite news |last=Dere |first=Mohan |date=2017-12-21 |title=How to integrate create-react-app with all the libraries you need to make a great app |language=en-US |work=freeCodeCamp |url=https://mediumwww.freecodecamp.org/integratingnews/how-to-make-create-react-app-redux-reactwork-routerwith-reduxa-observablenode-bootstrapbackend-altogetherapi-216db97e89a37c5c48acb1b0 |access-date=2018-06-14 }}
* {{cite news |last=Panchal |first=Krunal |date=2022-04-26 |title=Angular vs React Detailed Comparison |language=en-US |work=SitePoint |url=https://www.sitepoint.com/angular-vs-react/ |access-date=2023-06-05 |archive-date=2023-03-30 |archive-url=https://web.archive.org/web/20230330160838/https://www.sitepoint.com/angular-vs-react/ |url-status=live }}
* {{cite news |last1=Hámori |first1=Fenerec |title=The History of React.js on a Timeline |url=https://blog.risingstack.com/the-history-of-react-js-on-a-timeline/ |access-date=2023-06-05 |work=RisingStack |date=2022-05-31 |archive-date=2022-05-31 |archive-url=https://web.archive.org/web/20220531133616/https://blog.risingstack.com/the-history-of-react-js-on-a-timeline/ |url-status=live }}
* {{cite news |last=Lardinois |first=Frederic |title=Facebook announces React Fiber, a rewrite of its React libraryframework |date=2017-04-18 |url=https://www.infoworldtechcrunch.com/article2017/260818104/javascript18/reactfacebook-announces-makingreact-fasterfiber-a-smootherrewrite-uisof-forits-datareact-driven-web-apps.htmlframework/ |access-date=20232024-0612-0531 |website=[[InfoWorldTechCrunch]] |archive-date=2018-06-12 |archive-url=https://web.archive.org/web/20180612141516/https://www.infoworld.com/article/2608181/javascript/react--making-faster--smoother-uis-for-data-driven-web-apps.html |url-status=live }}
{{Refend}}