{"id":6643,"date":"2026-04-13T11:50:53","date_gmt":"2026-04-13T11:50:53","guid":{"rendered":"http:\/\/the-codest.localhost\/dictionary\/react\/"},"modified":"2026-04-13T11:50:53","modified_gmt":"2026-04-13T11:50:53","slug":"reagoida","status":"publish","type":"dictionary","link":"https:\/\/thecodest.co\/fi\/dictionary\/react\/","title":{"rendered":"React"},"content":{"rendered":"

React: kattava m\u00e4\u00e4ritelm\u00e4<\/h1>\n

React<\/a> on suosittu avoimen l\u00e4hdekoodin JavaScript<\/a> kirjasto, jota k\u00e4ytet\u00e4\u00e4n k\u00e4ytt\u00f6liittymien rakentamiseen. Sen kehitti Facebook, ja nyt sit\u00e4 yll\u00e4pit\u00e4\u00e4 kehitt\u00e4j\u00e4yhteis\u00f6. React on tunnettu kyvyst\u00e4\u00e4n luoda dynaamisia ja reagoivia k\u00e4ytt\u00f6liittymi\u00e4 minimaalisella koodauksella. Sit\u00e4 k\u00e4ytet\u00e4\u00e4n laajalti web<\/a> sovellukset, mobiilisovellukset ja jopa ty\u00f6p\u00f6yt\u00e4sovellukset.<\/p>\n

React perustuu komponenttien k\u00e4sitteeseen. Komponentti on itsen\u00e4inen kokonaisuus, joka koostuu seuraavista osista koodi<\/a> joita voidaan k\u00e4ytt\u00e4\u00e4 uudelleen koko sovelluksessa. Sit\u00e4 voidaan pit\u00e4\u00e4 rakennuspalikkana, joka voidaan yhdist\u00e4\u00e4 muihin komponentteihin t\u00e4ydellisen k\u00e4ytt\u00f6liittym\u00e4n luomiseksi. React-komponentit<\/a> rakennetaan k\u00e4ytt\u00e4m\u00e4ll\u00e4 yhdistelm\u00e4\u00e4 HTML:n kaltaisesta syntaksista, jota kutsutaan JSX:ksi ja JavaScript:ksi.<\/p>\n

Yksi React:n t\u00e4rkeimmist\u00e4 ominaisuuksista on sen virtuaalinen DOM (Document Object Model). Virtuaalinen DOM on varsinaisen DOM:n kevyt esitys. Kun komponenttiin tehd\u00e4\u00e4n muutos, React p\u00e4ivitt\u00e4\u00e4 virtuaalisen DOM:n varsinaisen DOM:n sijasta. N\u00e4in React voi tehokkaasti m\u00e4\u00e4ritt\u00e4\u00e4, mit\u00e4 muutoksia k\u00e4ytt\u00f6liittym\u00e4\u00e4n on teht\u00e4v\u00e4, ja p\u00e4ivitt\u00e4\u00e4 vain n\u00e4m\u00e4 k\u00e4ytt\u00f6liittym\u00e4n osat. Tuloksena on nopeampi render\u00f6inti ja sujuvampi k\u00e4ytt\u00f6kokemus.<\/p>\n

React on tunnettu my\u00f6s yksisuuntaisesta tiedot<\/a> virtaus. React:ss\u00e4 tiedot kulkevat yhteen suuntaan, vanhemmista komponenteista lapsikomponentteihin. T\u00e4m\u00e4 helpottaa tietojen hallintaa ja varmistaa, ett\u00e4 k\u00e4ytt\u00f6liittym\u00e4 on aina ajan tasalla.<\/p>\n

React on hyvin muokattavissa, ja sit\u00e4 voidaan k\u00e4ytt\u00e4\u00e4 muiden kirjastojen ja kehysten kanssa. Sit\u00e4 voidaan k\u00e4ytt\u00e4\u00e4 suosittujen front-end-kehysten kanssa, kuten esim. Angular<\/a> ja Vue<\/a>.js. Sit\u00e4 voidaan k\u00e4ytt\u00e4\u00e4 my\u00f6s back-end-kehysten kanssa, kuten esim. Node.js<\/a>.<\/p>\n

React:ll\u00e4 on suuri ja aktiivinen kehitt\u00e4j\u00e4yhteis\u00f6, joka osallistuu sen kehitt\u00e4miseen ja antaa tukea muille kehitt\u00e4jille. React:n oppimiseen on saatavilla lukuisia resursseja, kuten dokumentaatiota, opetusohjelmia ja verkkokursseja.<\/p>\n

Yhteenvetona voidaan todeta, ett\u00e4 React on tehokas ja joustava JavaScript-kirjasto, jota k\u00e4ytet\u00e4\u00e4n dynaamisten ja reagoivien k\u00e4ytt\u00f6liittymien rakentamiseen. Sen komponenttipohjainen arkkitehtuuri, virtuaalinen DOM ja yksisuuntainen tiedonkulku tekev\u00e4t siit\u00e4 ihanteellisen valinnan monimutkaisten sovellusten rakentamiseen. Sen suosio ja aktiivinen yhteis\u00f6 tekev\u00e4t siit\u00e4 arvokkaan ty\u00f6kalun kaikille kehitt\u00e4jille, jotka haluavat rakentaa nykyaikaisia verkkosovelluksia.<\/p>","protected":false},"excerpt":{"rendered":"

Tutustu React:hen, suosittuun avoimen l\u00e4hdekoodin JavaScript-kirjastoon, jota k\u00e4ytet\u00e4\u00e4n dynaamisten ja reagoivien k\u00e4ytt\u00f6liittymien rakentamiseen v\u00e4h\u00e4isell\u00e4 koodauksella.<\/p>","protected":false},"template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-6643","dictionary","type-dictionary","status-publish","hentry"],"acf":[],"yoast_head":"\nReact - The Codest<\/title>\n<meta name=\"description\" content=\"Learn about React, the popular open-source JavaScript library used for building dynamic and responsive user interfaces with minimal coding.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thecodest.co\/fi\/sanakirja\/reagoida\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"React\" \/>\n<meta property=\"og:description\" content=\"Learn about React, the popular open-source JavaScript library used for building dynamic and responsive user interfaces with minimal coding.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/thecodest.co\/fi\/sanakirja\/reagoida\/\" \/>\n<meta property=\"og:site_name\" content=\"The Codest\" \/>\n<meta property=\"og:image\" content=\"https:\/\/thecodest.co\/app\/uploads\/2024\/06\/cover-image.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/thecodest.co\\\/dictionary\\\/react\\\/\",\"url\":\"https:\\\/\\\/thecodest.co\\\/dictionary\\\/react\\\/\",\"name\":\"React - 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