{"id":103540,"date":"2022-03-15T03:37:00","date_gmt":"2022-03-15T01:37:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yazyk-javascript-predlozheno-dobavit-sintaksis-s-informacziej-o-tipah"},"modified":"2022-03-15T03:37:00","modified_gmt":"2022-03-15T01:37:01","slug":"v-yazyk-javascript-predlozheno-dobavit-sintaksis-s-informacziej-o-tipah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/v-yazyk-javascript-predlozheno-dobavit-sintaksis-s-informacziej-o-tipah","title":{"rendered":"Foi proposto adicionar uma sintaxe com informa\u00e7\u00f5es de tipos \u00e0 linguagem JavaScript.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

As empresas Microsoft, Igalia e Bloomberg apresentaram uma iniciativa para incluir na especifica\u00e7\u00e3o do JavaScript uma sintaxe para defini\u00e7\u00e3o expl\u00edcita de tipos, semelhante \u00e0 sintaxe usada na linguagem TypeScript. Atualmente, o prot\u00f3tipo das altera\u00e7\u00f5es proposto para inclus\u00e3o no padr\u00e3o ECMAScript est\u00e1 em discuss\u00e3o preliminar (Est\u00e1gio 0). Na pr\u00f3xima reuni\u00e3o de mar\u00e7o do comit\u00ea TC39, est\u00e1 previsto que o projeto avance para a primeira fase de considera\u00e7\u00e3o, envolvendo a comunidade de especialistas da ECMA. <\/p>\n

A disponibilidade de informa\u00e7\u00f5es claramente definidas sobre tipos ajudar\u00e1 a evitar muitos erros durante o desenvolvimento, permitir\u00e1 a utiliza\u00e7\u00e3o de t\u00e9cnicas adicionais de otimiza\u00e7\u00e3o, simplificar\u00e1 a depura\u00e7\u00e3o e tornar\u00e1 o c\u00f3digo mais leg\u00edvel e f\u00e1cil de modificar e manter por desenvolvedores externos. O suporte a tipos deve ser implementado como uma op\u00e7\u00e3o \u2014 motores e ambientes de execu\u00e7\u00e3o JavaScript que n\u00e3o suportam verifica\u00e7\u00e3o de tipos ir\u00e3o ignorar anota\u00e7\u00f5es com informa\u00e7\u00f5es sobre tipos e tratar o c\u00f3digo como antes, considerando os dados sobre tipos como coment\u00e1rios. No entanto, as ferramentas de verifica\u00e7\u00e3o de tipos poder\u00e3o identificar, com base nas informa\u00e7\u00f5es dispon\u00edveis, erros relacionados ao uso incorreto de tipos. <\/p>\n

Diferentemente das informa\u00e7\u00f5es de tipo fornecidas por anota\u00e7\u00f5es JSDoc, que s\u00e3o indicadas na forma de coment\u00e1rios, a defini\u00e7\u00e3o direta de tipos nas constru\u00e7\u00f5es de defini\u00e7\u00e3o de vari\u00e1veis tornar\u00e1 o c\u00f3digo mais visual, compreens\u00edvel e f\u00e1cil de editar. Por exemplo, ambientes de desenvolvimento integrados com suporte ao TypeScript poder\u00e3o destacar imediatamente os erros no c\u00f3digo JavaScript tipado sem convers\u00f5es adicionais. Al\u00e9m disso, o suporte integrado a tipos permitir\u00e1 a execu\u00e7\u00e3o de programas escritos em dialetos tipados do JavaScript, como TypeScript e Flow, sem a necessidade de transpilar de uma linguagem para outra.

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

\u0418\u0437 \u0442\u0438\u043f\u043e\u0432 \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u0435\u0442\u0441\u044f \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c «string», «number» \u0438 «boolean», \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0436\u043d\u043e \u0431\u0443\u0434\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u0440\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0438 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445, \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0439, \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432 \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432, \u043f\u043e\u043b\u0435\u0439 \u043a\u043b\u0430\u0441\u0441\u043e\u0432, \u0442\u0438\u043f\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043c\u0430\u0441\u0441\u0438\u0432\u043e\u0432 («number[]»). \u041f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u0435\u0442\u0441\u044f \u0442\u0430\u043a\u0436\u0435 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0442\u044c \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0451\u043d\u043d\u044b\u0445 \u0442\u0438\u043f\u043e\u0432 («string | number») \u0438 \u0434\u0436\u0435\u043d\u0435\u0440\u0438\u043a\u043e\u0432. let x: string; function add(a: number, b: number) { return a + b; } interface Person { name: string; age: number; } function foo<T>(x: T) { return x; } function foo(x: string | number): string | number { if (typeof x === number) { return x + 1 } else { return x + «!» } }
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Microsoft, Igalia \u0438 Bloomberg \u0432\u044b\u0441\u0442\u0443\u043f\u0438\u043b\u0438 \u0441 \u0438\u043d\u0438\u0446\u0438\u0430\u0442\u0438\u0432\u043e\u0439 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044e JavaScript \u0441\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441\u0430 \u0434\u043b\u044f \u044f\u0432\u043d\u043e\u0433\u043e \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0442\u0438\u043f\u043e\u0432, \u043f\u043e\u0445\u043e\u0436\u0435\u0433\u043e \u043d\u0430 \u0441\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0439 \u0432 \u044f\u0437\u044b\u043a\u0435 TypeScript. \u0412 \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0435\u0435 \u0432\u0440\u0435\u043c\u044f \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0439 \u0434\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442 ECMAScript, \u0432\u044b\u043d\u0435\u0441\u0435\u043d \u0434\u043b\u044f \u043f\u0440\u0435\u0434\u0432\u0430\u0440\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u043e\u0431\u0441\u0443\u0436\u0434\u0435\u043d\u0438\u0439 (Stage 0). \u041d\u0430 \u0431\u043b\u0438\u0436\u0430\u0439\u0448\u0435\u043c \u043c\u0430\u0440\u0442\u043e\u0432\u0441\u043a\u043e\u043c \u0437\u0430\u0441\u0435\u0434\u0430\u043d\u0438\u0438 \u043a\u043e\u043c\u0438\u0442\u0435\u0442\u0430 TC39 \u043f\u043b\u0430\u043d\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u043f\u0435\u0440\u0435\u0439\u0442\u0438 \u043d\u0430 \u043f\u0435\u0440\u0432\u0443\u044e \u0441\u0442\u0430\u0434\u0438\u044e \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0435\u043d\u0438\u044f \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u0441 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103541,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103540","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Prop\u00f5e-se adicionar ao JavaScript uma sintaxe com informa\u00e7\u00f5es de tipos | ProHoster","description":"As empresas Microsoft, Igalia e Bloomberg apresentaram uma iniciativa para incluir na especifica\u00e7\u00e3o do JavaScript uma sintaxe para 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