{"id":862,"date":"2024-05-06T19:43:28","date_gmt":"2024-05-06T22:43:28","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=862"},"modified":"2025-11-13T21:53:26","modified_gmt":"2025-11-14T00:53:26","slug":"async-e-await-javascript","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/async-e-await-javascript\/","title":{"rendered":"Async e Await Javascript"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Async e Await Javascript<\/strong>: O <strong><code>async\/await<\/code><\/strong>, introduzido no ECMAScript 2017 (ES8), \u00e9 a solu\u00e7\u00e3o mais elegante para lidar com Promises. Ele permite escrever c\u00f3digo ass\u00edncrono que <strong>se parece e se comporta como c\u00f3digo s\u00edncrono<\/strong>, eliminando a necessidade de encadeamentos longos de <code>.then()<\/code>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Na sua ess\u00eancia, o <code>async\/await<\/code> \u00e9 um <strong>a\u00e7\u00facar sint\u00e1tico<\/strong> sobre as Promises.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">1. As Palavras-Chave: <code>async<\/code> e <code>await<\/code><\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O <code>async\/await<\/code> funciona atrav\u00e9s da intera\u00e7\u00e3o de duas palavras-chave obrigat\u00f3rias:<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">A. <code>async<\/code> (A Fun\u00e7\u00e3o)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Usada para declarar que uma fun\u00e7\u00e3o \u00e9 ass\u00edncrona. Uma fun\u00e7\u00e3o <code>async<\/code> tem duas regras:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li class=\"has-medium-font-size\">Ela <strong>sempre retorna uma Promise<\/strong>, mesmo que voc\u00ea retorne um valor simples.<\/li>\n\n\n\n<li class=\"has-medium-font-size\">Ela permite o uso da palavra-chave <code>await<\/code> dentro de seu corpo.<\/li>\n<\/ol>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Retorna uma Promise resolvida com o valor 10\nasync function valorAsync() {\n  return 10; \n}\nvalorAsync().then(resultado =&gt; console.log(resultado)); \/\/ Sa\u00edda: 10\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">B. <code>await<\/code> (A Pausa)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Usada <strong>somente<\/strong> dentro de fun\u00e7\u00f5es <code>async<\/code>. O <code>await<\/code> faz com que a execu\u00e7\u00e3o da fun\u00e7\u00e3o <strong>pause<\/strong> at\u00e9 que a Promise \u00e0 sua direita seja <strong>resolvida<\/strong> (<code>fulfilled<\/code>). Uma vez resolvida, o valor \u00e9 extra\u00eddo e atribu\u00eddo \u00e0 vari\u00e1vel.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function buscarDados() {\n  \/\/ A fun\u00e7\u00e3o PAUSA aqui at\u00e9 que a Promise de 'fetch' resolva.\n  const response = await fetch('https:\/\/api.exemplo.com\/data'); \n  \n  \/\/ A fun\u00e7\u00e3o PAUSA novamente at\u00e9 que a Promise de 'json()' resolva.\n  const dados = await response.json(); \n  \n  return dados;\n}\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">2. Gerenciamento de Erros com <code>try...catch<\/code><\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Uma das maiores vantagens do <code>async\/await<\/code> \u00e9 a simplifica\u00e7\u00e3o do tratamento de erros. Em vez de usar o <code>.catch()<\/code> no final de uma cadeia, voc\u00ea pode usar o bloco <strong><code>try...catch<\/code><\/strong> familiar, exatamente como faria em c\u00f3digo s\u00edncrono.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Se qualquer Promise com <code>await<\/code> for <strong>rejeitada (<code>rejected<\/code>)<\/strong>, a exce\u00e7\u00e3o \u00e9 <strong>lan\u00e7ada<\/strong> e pode ser capturada pelo bloco <code>catch<\/code> mais pr\u00f3ximo.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function buscarDadosComTratamento() {\n  try {\n    const response = await fetch('url-invalida');\n    \n    \/\/ Se a requisi\u00e7\u00e3o acima falhar, o c\u00f3digo pula imediatamente para o 'catch'.\n    const data = await response.json();\n    return data;\n\n  } catch (error) {\n    console.error(\"Erro na busca de dados:\", error.message);\n    \/\/ Podemos retornar ou relan\u00e7ar o erro aqui, se necess\u00e1rio.\n    return null; \n  }\n}\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">3. Lidando com M\u00faltiplas Promises Independentes<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Quando voc\u00ea tem v\u00e1rias Promises que <strong>n\u00e3o dependem<\/strong> do resultado uma da outra, usar <code>await<\/code> sequencialmente as torna mais lentas, pois cada uma espera a anterior.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A solu\u00e7\u00e3o \u00e9 usar <strong><code>Promise.all()<\/code><\/strong> (introduzido no artigo anterior) em conjunto com <code>await<\/code>. Isso permite que as Promises sejam executadas em <strong>paralelo<\/strong>, e o <code>await<\/code> pausa apenas para coletar os resultados <strong>ap\u00f3s todas terem terminado<\/strong>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function buscarMultiplosDados() {\n  const promise1 = fetch('api\/data1');\n  const promise2 = fetch('api\/data2');\n\n  \/\/ As requisi\u00e7\u00f5es s\u00e3o iniciadas em paralelo, mas o await espera o resultado de AMBAS.\n  const &#91;res1, res2] = await Promise.all(&#91;promise1, promise2]); \n  \n  const data1 = await res1.json();\n  const data2 = await res2.json();\n\n  return { data1, data2 };\n}\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">\u2705 Conclus\u00e3o Async e Await Javascript<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Async e Await Javascript: O <code>async\/await<\/code> \u00e9 o <em>padr\u00e3o-ouro<\/em> para escrever c\u00f3digo ass\u00edncrono hoje. Ele transforma o gerenciamento de Promises em um fluxo de leitura <strong>linear e s\u00edncrono<\/strong>, simplifica o fluxo de controle e permite o uso natural do <strong><code>try...catch<\/code><\/strong> para lidar com erros. Ao dominar o <code>async\/await<\/code>, voc\u00ea escreve c\u00f3digo ass\u00edncrono que \u00e9 drasticamente mais <strong>limpo, leg\u00edvel e f\u00e1cil de depurar<\/strong> do que o encadeamento tradicional de <code>.then()<\/code>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Toda jornada tem um in\u00edcio, e o in\u00edcio para se tornar um desenvolvedor web \u00e9 dominar as seguintes tecnologias, que voc\u00ea encontra aqui mesmo:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/html\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html.webp\" alt=\"HTML\" class=\"wp-image-600\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">HTML<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/css\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux.webp\" alt=\"CSS\" class=\"wp-image-702\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">CSS<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/javascript\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript.webp\" alt=\"Javascript\" class=\"wp-image-804\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">JavaScript<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">E se voc\u00ea gosta do nosso conte\u00fado, n\u00e3o deixe de contribuir adquirindo os servi\u00e7os e produtos dos nossos apoiadores e empresas que somos associados:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/hostinger.com.br\/?REFERRALCODE=1THIAGO62\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/03\/hostinger.png\" alt=\"Hospedagem Hostinger\" class=\"wp-image-92\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNDYlc\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/ofertas-amazon.webp\" alt=\"Ofertas Amazon\" class=\"wp-image-1308\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNKmt0\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/amazonprime.webp\" alt=\"Amazon Prime\" class=\"wp-image-1307\"\/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>Async e Await Javascript: O async\/await, introduzido no ECMAScript 2017 (ES8), \u00e9 a solu\u00e7\u00e3o mais&#8230;<\/p>\n","protected":false},"author":1,"featured_media":804,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-862","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","wpcat-8-id"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Async e Await Javascript - BLOG THIAGO ROSSI<\/title>\n<meta name=\"description\" content=\"Async e Await Javascript: Neste artigo, vamos mergulhar no mundo do async\/await, explorando como essa sintaxe moderna simplifica a ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thiagorossi.com.br\/blog\/async-e-await-javascript\/\" \/>\n<meta property=\"og:locale\" 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