{"id":3293,"date":"2023-05-07T06:12:26","date_gmt":"2023-05-07T06:12:26","guid":{"rendered":"http:\/\/the-codest.localhost\/blog\/hire-react-js-developer\/"},"modified":"2026-03-05T10:50:02","modified_gmt":"2026-03-05T10:50:02","slug":"rada-react-js-throunaradila","status":"publish","type":"post","link":"https:\/\/thecodest.co\/is\/blog\/hire-react-js-developer\/","title":{"rendered":"R\u00e1\u00f0a React.js-\u00fer\u00f3unara\u00f0ila"},"content":{"rendered":"

A\u00f0 n\u00fdta kraft n\u00fdjustu og kraftmestu t\u00e6kni getur lyft frammist\u00f6\u00f0u fyrirt\u00e6kis \u00fe\u00edns til sk\u00fdja. Ef \u00fe\u00fa hefur veri\u00f0 a\u00f0 kanna n\u00fdst\u00e1rlega t\u00e6kni, er \u00e9g viss um a\u00f0 \u00fe\u00fa hafir rekist \u00e1 hugtaki\u00f0 \u2018React\u2019 sem tengist vef\u00fer\u00f3un<\/a><\/strong>. \u00dea\u00f0 hefur teki\u00f0 mi\u00f0svi\u00f0i\u00f0 \u00ed n\u00fat\u00edma forritunarvenjum og er jafnt eftirs\u00f3tt af m\u00f6rgum sprotafyrirt\u00e6kjum sem Fortune 500-fyrirt\u00e6kjum. En af hverju er svona miki\u00f0 umtal um \u00fea\u00f0? Og ef \u00fea\u00f0 er svona gott \u2013 hvernig r\u00e6\u00f0ur\u00f0u s\u00e9rfr\u00e6\u00f0ing? React<\/a>.js-\u00fer\u00f3unara\u00f0ili<\/strong>? Vi\u00f0 munum kafa ofan \u00ed \u00feessar br\u00fdnu spurningar, svo fylgist me\u00f0!<\/p>\n

Hva\u00f0 er React?<\/h2>\n

\u00c1\u00f0ur en \u00fe\u00fa stekkur beint \u00fat \u00ed leit a\u00f0 snilldart\u00f6lvunarfr\u00e6\u00f0ingi, er gagnlegt okkur<\/a> J\u00e6ja, til a\u00f0 skilja hva\u00f0 vi\u00f0 erum a\u00f0 f\u00e1st vi\u00f0. H\u00e9r kemur: React (e\u00f0a eins og forritarar kalla \u00fea\u00f0, React.js\/ReactJS). F\u00e6dd af Facebook \u00e1ri\u00f0 2013 eftir \u00edtarlegar ranns\u00f3knir og s\u00ed\u00f0ar opnu\u00f0 sem opinn hugb\u00fana\u00f0ur fyrir almennan notkun, \u00feessi snjalli JavaScript<\/a> B\u00f3kasafn einfaldar ger\u00f0 gagnvirkra Notendavi\u00f0m\u00f3t<\/strong> (UI) eins og engin \u00f6nnur.<\/p>\n

Me\u00f0 \u00fev\u00ed a\u00f0 tileinka s\u00e9r \u00edhlutami\u00f0a\u00f0a arkitekt\u00far opnar React lei\u00f0ina fyrir endurnotkun k\u00f3\u00f0i<\/a> Brot \u2013 stykki fyrir stykki \u00fe\u00fd\u00f0ing \u00fear sem hver spar\u00f0ur stafur skiptir m\u00e1li til a\u00f0 tryggja hn\u00f6kralausa virkni b\u00e6\u00f0i hj\u00e1 notandanum og \u00ed bakenda. \u00c1rangursr\u00edk og hr\u00f6\u00f0 birting er enn ein gl\u00e6sileg afrek sem n\u00e6st me\u00f0 innlei\u00f0ingu s\u00fdndar-skj\u00f6lhlutal\u00edkans (DOM), sem eykur verulega vi\u00f0brag\u00f0shra\u00f0a vefs\u00ed\u00f0unnar e\u00f0a forritsins \u00fe\u00edns.<\/p>\n

\u00deegar \u00fe\u00fa heyrir f\u00f3lk hr\u00f3sa \u00fev\u00ed a\u00f0 r\u00e1\u00f0a reynda react.js-forritara e\u00f0a leita a\u00f0 \u2018reactjs-st\u00f6rfum n\u00e1l\u00e6gt m\u00e9r\u2019, er \u00fea\u00f0 \u00ed raun a\u00f0 tala um a\u00f0 n\u00e1 til h\u00e6fra byggingarmeistara sem geta n\u00fdtt \u00feetta \u00f6fluga verkf\u00e6rakistu til a\u00f0 b\u00faa til fram\u00farskarandi vi\u00f0m\u00f3t \u2013 og gera \u00fe\u00e1 \u00fear me\u00f0 \u00f3missandi au\u00f0lindir fyrir hva\u00f0a frams\u00e6kna verkefni sem er.<\/p>\n

Af hverju halda fyrirt\u00e6ki \u00e1fram a\u00f0 velja React?<\/h2>\n

\u00cd \u00f6rt vaxandi samkeppnishar\u00f0ri stafr\u00e6nni marka\u00f0ur<\/a>, fyrirt\u00e6ki halda \u00e1fram a\u00f0 samr\u00e6ma lei\u00f0ir s\u00ednar til a\u00f0 r\u00e1\u00f0a react.js forritarar<\/strong>. En hva\u00f0 kn\u00fdr \u00feessa tilhneigingu til a\u00f0 r\u00e1\u00f0a reactjs forritarar<\/strong>? Sko\u00f0um nokkrar lykil\u00e1st\u00e6\u00f0ur sem liggja a\u00f0 baki \u00feessari \u00fer\u00f3un.<\/p>\n

\u00cd fyrsta lagi hefur React.js, sem Facebook skapa\u00f0i, gj\u00f6rbreytt \u00fev\u00ed hvernig forrit eru sm\u00ed\u00f0u\u00f0 \u00ed dag. Einstaka s\u00fdndar-DOM-eiginleiki \u00feess tryggir h\u00e1marks fars\u00edmi forritager\u00f0<\/a><\/strong> frammist\u00f6\u00f0u, sem er \u00f3missandi \u00ed hra\u00f0u t\u00e6kniv\u00e6nu umhverfi. \u00deegar kemur a\u00f0 \u00fer\u00f3un fl\u00f3kinna notendavi\u00f0m\u00f3t<\/strong> E\u00f0a \u00ed einbla\u00f0sa\u00f0forritum er skilvirkni \u00feessarar JavaScript-b\u00f3kasafns \u00f3vi\u00f0jafnanleg \u2013 helsta \u00e1st\u00e6\u00f0a \u00feess a\u00f0 fyrirt\u00e6ki streyma til react-forritara.<\/p>\n

Ennfremur er React \u00feekkt fyrir \u00edhlutami\u00f0a\u00f0a arkitekt\u00far. \u00deetta gerir kleift a\u00f0 innloka hluta forritsins \u00fe\u00edns \u00ed einstaka \u00edhluti sem sj\u00e1 um eigin \u00e1stand og h\u00e6gt er a\u00f0 endurn\u00fdta \u00ed mismunandi verkefnum; sem sparar \u00fer\u00f3unart\u00edma og dregur \u00far forritunarvillum.<\/p>\n

Auk \u00feess n\u00fdtur React \u00f6flugrar samf\u00e9lagsstu\u00f0nings. \u00dear sem um opinn hugb\u00fana\u00f0 me\u00f0 al\u00fej\u00f3\u00f0legri notkun er a\u00f0 r\u00e6\u00f0a, er til gn\u00e6g\u00f0 au\u00f0linda sem n\u00fdtast vi\u00f0 lausn vandam\u00e1la og s\u00edfellda n\u00e1m \u2013 eitthva\u00f0 sem er ekki einungis gagnlegt fyrir framhli\u00f0ar\u00fer\u00f3un<\/strong> og fyrir sj\u00e1lfst\u00e6tt starfandi react forritarar<\/strong> en einnig mj\u00f6g hagst\u00e6tt fr\u00e1 vi\u00f0skiptalegu sj\u00f3narhorni hva\u00f0 var\u00f0ar r\u00e1\u00f0gj\u00f6f og bilanaleit.<\/p>\n

Auk \u00feessara \u00fe\u00e1tta, a\u00f0 velja a\u00f0 r\u00e1\u00f0a einn react.js forritari<\/strong> g\u00e6ti hugsanlega einnig leitt til kostna\u00f0arsparna\u00f0ar. \u00c1st\u00e6\u00f0an er s\u00fa a\u00f0 f\u00e6rir reactjs forritarar<\/strong> getur n\u00fdtt s\u00e9r \u00e1 skilvirkan h\u00e1tt endurn\u00fdtanlega \u00edhluti React til a\u00f0 einfalda hugb\u00fana\u00f0ar\u00fer\u00f3un<\/a><\/strong> ferli: f\u00e6rri vinnustundir \u00fe\u00fd\u00f0a l\u00e6gri kostna\u00f0.<\/p>\n

A\u00f0 lokum, geta React.js a\u00f0 sam\u00fe\u00e6tta hn\u00f6kralaust vi\u00f0 a\u00f0ra forritunarm\u00e1l<\/a><\/strong> gerir \u00fea\u00f0 a\u00f0 f\u00fdsilegri valkosti fyrir fyrirt\u00e6ki sem leita a\u00f0 Stigst\u00e6r\u00f0<\/a> \u00e1 sama t\u00edma og komi\u00f0 er \u00ed veg fyrir allar hugsanlegar t\u00e6knilegar l\u00e6singar.<\/p>\n

\u00deess vegna sta\u00f0festir \u00fea\u00f0 a\u00f0 draga fram einungis \u00feessa fimm punkta hvers vegna fyrirt\u00e6ki halda \u00e1fram a\u00f0 ve\u00f0ja \u00e1 hugmyndina um \u2018r\u00e1\u00f0a til starfa React \u00fer\u00f3unara\u00f0ili<\/a><\/strong>\u2019\u00d3a\u00f0finnanlegur \u00e1rangur, \u00fe\u00e6gindi endurn\u00fdtingar \u00edhluta sem au\u00f0velda hra\u00f0a afgrei\u00f0slu, st\u00f6\u00f0ugur samf\u00e9lagsstu\u00f0ningur sem sty\u00f0ur vi\u00f0 lausn vandam\u00e1la \u2013 auk t\u00e6kif\u00e6ris til a\u00f0 draga \u00far kostna\u00f0i og tryggja framt\u00ed\u00f0ar samr\u00fdmanleika vi\u00f0 st\u00e6kkun. Me\u00f0 \u00f6llum \u00feessum kostum sameinu\u00f0um undir einum hatti sem kallast \u2018React\u2019, hver myndi ekki velja \u00fea\u00f0?<\/p>\n

Hver eru \u00e1vinningarnir af React?<\/h2>\n

React.js e\u00f0a einfaldlega React hefur gj\u00f6rbreytt leiknum \u00ed \u00fer\u00f3un vefums\u00f3kna<\/a>, sem margir forritarar og fyrirt\u00e6ki um allan heim kj\u00f3sa. Ef \u00fe\u00fa ert a\u00f0 \u00edhuga a\u00f0 r\u00e1\u00f0a React.js forritari<\/strong> fyrir n\u00e6sta \u00feitt vefur<\/a> \u00fer\u00f3un verkefni<\/a><\/strong>, \u00dea\u00f0 v\u00e6ri gagnlegt a\u00f0 skilja hva\u00f0 gerir \u00fea\u00f0 a\u00f0 svo a\u00f0la\u00f0andi vali. Nokkrir s\u00e9rstakir kostir koma til s\u00f6gunnar \u00feegar opinn hugb\u00fana\u00f0urinn JavaScript-b\u00f3kasafni\u00f0 er nota\u00f0.<\/p>\n

Forsimpla\u00f0 b\u00fana\u00f0arsk\u00f6pun og endurn\u00fdting<\/h2>\n

Fyrst og fremst gerir React-b\u00f3kasafni\u00f0 forriturum kleift a\u00f0 b\u00faa til innhylkta einingar sem stj\u00f3rna eigin \u00e1standi. \u00deessar einingar er h\u00e6gt a\u00f0 endurn\u00fdta hn\u00f6kralaust \u00ed mismunandi hlutum forritsins. Me\u00f0 \u00fev\u00ed a\u00f0 stu\u00f0la a\u00f0 k\u00f3\u00f0avi\u00f0n\u00e1m f\u00e1 verkefni sterkari samheldni og minni tengingu \u2013 sem styttir \u00fer\u00f3unart\u00edma og dregur \u00far l\u00edkum \u00e1 villum. \u00deessi einfaldleiki og skilvirkni eru sterkar \u00e1st\u00e6\u00f0ur fyrir \u00fev\u00ed a\u00f0 fyrirt\u00e6ki kj\u00f3sa oft a\u00f0 Leigja react javascript<\/a> \u00fer\u00f3unara\u00f0ili<\/strong>.<\/p>\n

H\u00e1g\u00e6\u00f0a frammista\u00f0a<\/h3>\n

Anna\u00f0 \u00e1berandi kostur er frammista\u00f0an sem f\u00e6st vi\u00f0 notkun s\u00fdndar-DOM (Document Object Model). Hef\u00f0bundin breyting \u00e1 raunverulegum DOM getur h\u00e6gja\u00f0 \u00e1 fl\u00f3knum forritum \u00fear sem uppf\u00e6rslur kalla fram v\u00ed\u00f0t\u00e6kar breytingar \u00ed HTML-skj\u00f6lum; s\u00fdndar-DOM heldur hins vegar au\u00f0lindanotkun \u00ed h\u00e1marki \u00fev\u00ed a\u00f0eins breyttir \u00fe\u00e6ttir eru uppf\u00e6r\u00f0ir \u00e1 raunverulegri vefs\u00ed\u00f0u.<\/p>\n

Sterkt samf\u00e9lagsstu\u00f0ningur<\/h3>\n

React, stofna\u00f0 af Facebook verkfr\u00e6\u00f0ingar<\/a>, \u00dea\u00f0 st\u00e1tar af v\u00ed\u00f0t\u00e6ku samf\u00e9lagi s\u00e9rfr\u00f3\u00f0ra react-forritara sem st\u00f6\u00f0ugt leggja fram umb\u00e6tur og hugmyndir. Svo ef \u00fe\u00fa ert a\u00f0 leita a\u00f0 a\u00f0sto\u00f0 e\u00f0a \u00fer\u00e1ir m\u00f6guleika \u00e1 \u00fat\u00feenslu, \u00fe\u00e1 dregur r\u00e1\u00f0ning Reactjs-\u00fer\u00f3unara \u00feig inn \u00ed \u00feetta l\u00edflega vistkerfi \u00fear sem samvinna bl\u00f3mstrar.<\/p>\n

Samh\u00e6fni vi\u00f0 fj\u00f6lbreytt verkf\u00e6ri<\/h3>\n

A\u00f0 vera afar fj\u00f6lh\u00e6fur telst einnig me\u00f0al styrkleika \u00feess. \u00dea\u00f0 vinnur \u00ed samhlj\u00f3mi me\u00f0 fj\u00f6lbreyttum forritunarm\u00e1lum eins og JavaScript (JS), \u00fear \u00e1 me\u00f0al ES2015\/ES2016-sta\u00f0lum, og TypeScript(TS), sem gerir \u00fea\u00f0 samh\u00e6ft vi\u00f0 fj\u00f6lda verkf\u00e6ra. Ef markmi\u00f0 \u00feitt er m\u00f3duleiningager\u00f0 fremur en d\u00fdnam\u00edskir eiginleikar \u00ed kerfislausn, \u00fe\u00e1 er gagnlegt a\u00f0 hafa freelance react forritarar<\/strong> \u00dea\u00f0 mun vera hagst\u00e6tt um bor\u00f0.<\/p>\n

Til a\u00f0 draga saman: endurn\u00fdtanleiki k\u00f3\u00f0a, mikil afk\u00f6st vegna notkunar \u00e1 s\u00fdndar-DOM, umfangsmikill stu\u00f0ningur samf\u00e9lagsins, fj\u00f6lh\u00e6fni og samr\u00fdmanleiki gera React a\u00f0 a\u00f0la\u00f0andi t\u00f3li fyrir vef\u00fer\u00f3un sem erfitt er a\u00f0 hunsa \u00feegar stefnt er a\u00f0 h\u00e1g\u00e6\u00f0a forritum.<\/p>\n

Forrit sem React kynnir<\/h2>\n

React.js, opinn hugb\u00fana\u00f0argrunnur fyrir JavaScript sem Facebook sty\u00f0ur, hefur hloti\u00f0 v\u00ed\u00f0t\u00e6ka \u00fatbrei\u00f0slu \u00ed t\u00e6knigeiranum vegna mikillar afk\u00f6st og sveigjanleika. Fj\u00f6ldi forrita hefur veri\u00f0 \u00fer\u00f3a\u00f0ur \u00e1 \u00feessum vettvangi \u00ed \u00fdmsum geirum, sem sta\u00f0festir enn frekar v\u00ed\u00f0t\u00e6ka a\u00f0dr\u00e1ttarafl \u00feess.<\/p>\n

Forrit \u00e1 einni s\u00ed\u00f0u<\/p>\n

Einbladsforrit (SPAs) eru ein helsta notkunartilvik \u00fear sem React sk\u00edn sk\u00e6rt. Eins og nafni\u00f0 gefur til kynna starfa SPA-forrit innan eins vefs\u00ed\u00f0u til a\u00f0 bj\u00f3\u00f0a upp \u00e1 hn\u00f6kralausa notendaupplifun sem l\u00edkist skj\u00e1bor\u00f0sforritum. \u00deetta er gagnlegt \u00e1 s\u00ed\u00f0um \u00fear sem efni \u00fearf a\u00f0 uppf\u00e6rast d\u00fdnam\u00edskt \u00e1n \u00feess a\u00f0 krefjast fullrar endurn\u00fdjunar \u00e1 s\u00ed\u00f0unni. Forritarar finna a\u00f0 \u00fea\u00f0 a\u00f0 byggja SPA-forrit me\u00f0 React einfaldar vinnufl\u00e6\u00f0i \u00feeirra vegna \u00fe\u00e6ttismi\u00f0a\u00f0rar uppbyggingar.<\/p>\n

H\u00e9r eru nokkur \u00e1berandi d\u00e6mi:<\/p>\n