{"id":99353,"date":"2021-03-05T04:22:37","date_gmt":"2021-03-05T02:22:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/google-predstavil-frejmvork-flutter-2-i-yazyk-dart-2-12"},"modified":"2021-03-05T04:22:37","modified_gmt":"2021-03-05T02:22:39","slug":"google-predstavil-frejmvork-flutter-2-i-yazyk-dart-2-12","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/google-predstavil-frejmvork-flutter-2-i-yazyk-dart-2-12","title":{"rendered":"Google tutvustas raamistikku Flutter 2 ja keelt Dart 2.12.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Google esitles kasutajaliidese raamistikku Flutter 2, mis t\u00e4histab projekti \u00fcleminekut mobiilirakenduste arendamise raamistikust universaalseks raamistikuks, millega saab luua mistahes t\u00fc\u00fcpi programme, sealhulgas t\u00f6\u00f6lauarakendusi ja veebirakendusi. <\/p>\n

Flutterit peetakse React Native'i alternatiiviks ning selle abil on v\u00f5imalik \u00fche koodibaasi p\u00f5hjal luua rakendusi erinevatele platvormidele, sealhulgas iOS, Android, Windows, macOS ja Linux, samuti brauserites k\u00e4ivitatavaid rakendusi. Varasemalt Flutter 1-l kirjutatud mobiilirakendused saavad p\u00e4rast \u00fcleminekut Flutter 2-le t\u00f6\u00f6tada t\u00f6\u00f6laudade ja veebis ilma koodi \u00fcmberkirjutamiseta. <\/p>\n

Flutteri p\u00f5hikood on kirjutatud Dart keeles ja rakenduste k\u00e4itamise mootor on kirjutatud C++ keeles. Rakenduste arendamisel saab lis\u00e4ksi Dartile, mis on Flutteri p\u00f5hikeel, kasutada Dart Foreign Function Interface'i, et kutsuda C\/C++ koodi. Suure j\u00f5udluse saavutamine toimub rakenduste kompileerimise kaudu masinkoodiks sihtplatvormidele. Samuti ei ole programmi p\u00e4rast iga muudatust vaja uuesti kompileerida \u2014 Dart pakub kuuma laadimise re\u017eiimi, mis v\u00f5imaldab muuta t\u00f6\u00f6tavat rakendust ja kohe tulemusi hinnata. <\/p>\n

Flutter 2 tutvustab t\u00e4iendavat tuge rakenduste arendamiseks veebis, sobiv suuremate juurutuste jaoks. R\u00e4\u00e4gitakse kolmest peamisest rakendustegevuse stsenaariumist Flutteri veebis: eraldiseisvate veebirakenduste (PWA, Progreessive Web Apps) arendamine, \u00fche lehe veebirakenduste (SPA, Single Page Apps) loomine ja mobiilirakenduste konverteerimine veebirakendusteks. Veebiarenduse t\u00f6\u00f6riistade omadustest t\u00f5stetakse esile 2D ja 3D-graafika joonistamise kiirusmehhanismide kaasamist, ekraanil elementide paigutamise paindlikkust ja WebAssembly-sse kompileeritud joonistamise mootori CanvasKit. <\/p>\n

T\u00f6\u00f6lauarakenduste tugi on beetaversioonis ja stabiliseeritakse k\u00e4esoleva aasta jooksul j\u00e4rgmistes v\u00e4ljaannetes. Flutteri arendamise toetamisest on teatanud ettev\u00f5tted Canonical, Microsoft ja Toyota. Canonical on valinud Flutteri oma rakenduste peamise raamistikuna, sealhulgas kasutab seda uue Ubuntu paigaldaja arendamisel. Microsoft on kohandanud Flutterit kokkuklapitavate mitme ekraaniga seadmete, n\u00e4iteks Surface Duo jaoks. Toyota kavatseb kasutada Flutterit autode multimeedia s\u00fcsteemides. Flutteril p\u00f5hineb ka Google'i arendatav mikrokerne operatsioonis\u00fcsteem Fuchsia, millel on kohandatud kasutajaliides.

\"Google<\/center> <\/p>\n

Samaeges on v\u00e4lja antud programmeerimiskeele Dart 2.12 versioon, kus j\u00e4tkub oluliselt \u00fcmber t\u00f6\u00f6tatud Dart 2 haru arendamine. Dart 2 erineb algsest Dart keele versioonist tugeva staatilise t\u00fc\u00fcbi s\u00fcsteemi kasutamise kaudu (t\u00fc\u00fcbid v\u00f5ivad automaatselt v\u00e4lja tuua, seega pole t\u00fc\u00fcpide m\u00e4\u00e4ramine kohustuslik, kuid d\u00fcnaamilist t\u00fc\u00fcbi m\u00e4\u00e4ramist enam ei kasutata ja esialgne t\u00fc\u00fcp kinnitatakse muutujale ning sellele j\u00e4rgneb rangem t\u00fc\u00fcbikontroll). <\/p>\n

Uudis on m\u00e4rkimisv\u00e4\u00e4rne, kuna stabiliseeriti nullv\u00e4\u00e4rtuse (null safety) ohutu kasutamise re\u017eiim, mis aitab v\u00e4ltida t\u00f5rkeid, mis tulenevad proovimisel kasutada muutujaid, mille v\u00e4\u00e4rtused ei ole m\u00e4\u00e4ratud ja on seatud nulliks. See re\u017eiim t\u00e4hendab, et muutujaid ei saa m\u00e4\u00e4rata m\u00e4\u00e4ramata v\u00e4\u00e4rtustega, kui neile ei antud selgelt v\u00e4\u00e4rtust null. Re\u017eiim arvestab rangelt muutuja t\u00fc\u00fcpe, mis v\u00f5imaldab kompilaatoril rakendada t\u00e4iendavaid optimeerimisi. T\u00fc\u00fcpide vastavust kontrollitakse kompileerimise ajal; n\u00e4iteks, kui \u00fcritatakse m\u00e4\u00e4rata nullv\u00e4\u00e4rtust muutuja t\u00fc\u00fcbile, mis ei toeta m\u00e4\u00e4ramatuid seisundeid, nagu int, genereeritakse viga. <\/p>\n

Teine oluline t\u00e4iustus Dart 2.12-s oli stabiilne FFI teekide teostus, mis v\u00f5imaldab luua k\u00f5rge j\u00f5udlusega koodi, mis v\u00f5imaldab k\u00f5nelda C-keele API-dega. Tehtud on j\u00f5udluse ja suuruse optimeerimisi. Lisatud on t\u00f6\u00f6riistad arendajatele ja koodiprofiilimise s\u00fcsteem, mis on kirjutatud Flutteri kasutades, lisaks uued pluginad Dart ja Flutter rakenduste arendamiseks Android Studio\/IntelliJ ja VS Code jaoks.

\"Google<\/center>
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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Flutterit peetakse React Native'i alternatiiviks ja see v\u00f5imaldab \u00fche koodibaasi p\u00f5hjal t\u00f6\u00f6tada rakendustega erinevatele platvormidele, sealhulgas iOS, Android,","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/google-predstavil-frejmvork-flutter-2-i-yazyk-dart-2-12","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47Google \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a Flutter 2 \u0438 \u044f\u0437\u044b\u043a Dart 2.12 | ProHoster","og:description":"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Google \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f Flutter 2, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u0437\u043d\u0430\u043c\u0435\u043d\u043e\u0432\u0430\u043b \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0438\u0437 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a\u0430 \u0434\u043b\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043c\u043e\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u0432 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0430\u043b\u044c\u043d\u044b\u0439 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043b\u044e\u0431\u044b\u0445 \u0442\u0438\u043f\u043e\u0432 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c, \u0432\u043a\u043b\u044e\u0447\u0430\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b \u0434\u043b\u044f \u043d\u0430\u0441\u0442\u043e\u043b\u044c\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c \u0438 web-\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f. 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