{"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\/it\/blog\/novosti-interneta\/google-predstavil-frejmvork-flutter-2-i-yazyk-dart-2-12","title":{"rendered":"Google ha presentato il framework Flutter 2 e il linguaggio Dart 2.12.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Google ha presentato il framework per la creazione di interfacce utente Flutter 2, che segna la trasformazione del progetto da framework per lo sviluppo di applicazioni mobili a un framework universale per la creazione di qualsiasi tipo di programma, inclusi quelli per sistemi desktop e applicazioni web.     <\/p>\n<p>Flutter \u00e8 considerato un'alternativa a React Native e consente, a partire da una singola base di codice, di rilasciare applicazioni per diverse piattaforme, inclusi iOS, Android, Windows, macOS e Linux, oltre ad applicazioni da eseguire nei browser. Le applicazioni mobili scritte in Flutter 1 potranno essere adattate per lavorare su desktop e web senza riscrivere il codice dopo il passaggio a Flutter 2.        <\/p>\n<p>La parte principale del codice Flutter \u00e8 implementata nel linguaggio Dart, mentre il motore runtime per l'esecuzione delle applicazioni \u00e8 scritto in C++. Durante lo sviluppo delle applicazioni, oltre al linguaggio Dart, nativo per Flutter, \u00e8 possibile utilizzare l'interfaccia Dart Foreign Function per chiamare codice C\/C++. L'alta performance \u00e8 raggiunta grazie alla compilazione delle applicazioni in codice macchina per le piattaforme target. In questo modo, non \u00e8 necessario ricompilare il programma dopo ogni modifica \u2014 Dart offre una modalit\u00e0 di hot reload, che consente di apportare modifiche all'applicazione in esecuzione e valutare immediatamente il risultato.    <\/p>\n<p>Flutter 2 annuncia il supporto completo per lo sviluppo di applicazioni per il Web, adatto per implementazioni lavorative. Vengono menzionati tre scenari principali per l'uso di Flutter per il Web: sviluppo di applicazioni web autonome (PWA, Progressive Web Apps), creazione di applicazioni web a pagina singola (SPA, Single Page Apps) e conversione di applicazioni mobili in applicazioni web. Tra le caratteristiche degli strumenti di sviluppo per il Web ci sono l'utilizzo di meccanismi di accelerazione per il rendering di grafica 2D e 3D, una flessibile disposizione degli elementi sullo schermo e un motore di rendering CanvasKit compilabile in WebAssembly.      <\/p>\n<p>Il supporto per le applicazioni desktop \u00e8 attualmente in fase di beta testing e sar\u00e0 stabilizzato quest'anno in uno dei prossimi aggiornamenti. Le aziende Canonical, Microsoft e Toyota hanno annunciato il supporto per lo sviluppo tramite Flutter. Canonical ha scelto Flutter come framework principale per le sue applicazioni e lo utilizza anche nello sviluppo di un nuovo installer per Ubuntu. Microsoft ha adattato Flutter per dispositivi pieghevoli con pi\u00f9 schermi, come il Surface Duo. Toyota prevede di utilizzare Flutter per i sistemi di infotainment automobilistico. La shell personalizzata dell'operating system a microkernel Fuchsia, in sviluppo presso Google, \u00e8 anch'essa basata su Flutter.     <center><img decoding=\"async\" alt=\"Google ha presentato il framework Flutter 2 e il linguaggio Dart 2.12.\" src=\"\/wp-content\/uploads\/2021\/03\/00588e230bc64b7de46ec4794b1566cf.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>\u00c8 stato contemporaneamente pubblicato il rilascio del linguaggio di programmazione Dart 2.12, che continua lo sviluppo della versione radicalmente riprogettata di Dart 2. Dart 2 si distingue dalla versione originale del linguaggio Dart per l'uso di una forte tipizzazione statica (i tipi possono essere dedotti automaticamente, pertanto l'indicazione dei tipi non \u00e8 obbligatoria, ma la tipizzazione dinamica non \u00e8 pi\u00f9 utilizzata e il tipo calcolato inizialmente \u00e8 fissato alla variabile, quindi viene applicato un controllo rigoroso del tipo).    <\/p>\n<p>L'uscita \u00e8 caratterizzata dalla stabilizzazione della modalit\u00e0 di uso sicuro del valore \u00abNull\u00bb (null safety), che consente di evitare i crash causati da tentativi di utilizzo di variabili il cui valore non \u00e8 definito e impostato su \u00abNull\u00bb. Questa modalit\u00e0 implica che le variabili non possono avere valori indefiniti, a meno che non venga esplicitamente assegnato il valore null. In questa modalit\u00e0, i tipi di variabili sono rigorosamente verificati, permettendo al compilatore di applicare ottimizzazioni aggiuntive. La corrispondenza dei tipi \u00e8 controllata in fase di compilazione, ad esempio, nel caso di un tentativo di assegnazione del valore \u00abNull\u00bb a una variabile con un tipo che non prevede uno stato indefinito, come \u00abint\u00bb, verr\u00e0 generato un errore.     <\/p>\n<p>Un altro importante miglioramento di Dart 2.12 \u00e8 stata l'implementazione stabile della libreria FFI, che consente di scrivere codice ad alte prestazioni in grado di accedere alle API in linguaggio C. Sono state effettuate ottimizzazioni in termini di prestazioni e dimensioni. Sono stati aggiunti strumenti per gli sviluppatori e un sistema di profiling del codice, scritti utilizzando Flutter, insieme a nuovi plugin per lo sviluppo di applicazioni in Dart e Flutter per Android Studio\/IntelliJ e VS Code.    <center><img decoding=\"async\" alt=\"Google ha presentato il framework Flutter 2 e il linguaggio Dart 2.12.\" src=\"\/wp-content\/uploads\/2021\/03\/f52789d30ed7b078ed57d0727e5be8cf.png\" style=\"display:block;margin: 0 auto;\" \/><\/center><br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=54701\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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. Flutter \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u0430\u043b\u044c\u0442\u0435\u0440\u043d\u0430\u0442\u0438\u0432\u0430 React Native \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u043e\u0434\u043d\u043e\u0439 \u043a\u043e\u0434\u043e\u0432\u043e\u0439 \u0431\u0430\u0437\u044b \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0442\u044c \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u0434\u043b\u044f \u0440\u0430\u0437\u043d\u044b\u0445 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c, \u0432\u043a\u043b\u044e\u0447\u0430\u044f iOS, Android, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":99354,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-99353","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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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