{"id":832,"date":"2024-05-01T13:39:00","date_gmt":"2024-05-01T16:39:00","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=832"},"modified":"2025-11-13T10:46:48","modified_gmt":"2025-11-13T13:46:48","slug":"expressoes-javascript","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/expressoes-javascript\/","title":{"rendered":"Express\u00f5es 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>Express\u00f5es Javascript<\/strong>: Em JavaScript, tudo que pode ser avaliado para produzir um valor \u00e9 uma <strong>Express\u00e3o<\/strong>. Elas s\u00e3o o bloco de constru\u00e7\u00e3o fundamental para realizar qualquer c\u00e1lculo, compara\u00e7\u00e3o ou acesso a dados.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Express\u00e3o vs. Instru\u00e7\u00e3o (<em>Statement<\/em>):<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Express\u00e3o:<\/strong> Produz um <strong>valor<\/strong>. (Ex: <code>2 + 3<\/code>)<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Instru\u00e7\u00e3o (<em>Statement<\/em>):<\/strong> Executa uma <strong>a\u00e7\u00e3o<\/strong>. (Ex: <code>if (condi\u00e7\u00e3o) { ... }<\/code>)<\/li>\n<\/ul>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Neste artigo, exploramos os diferentes tipos de express\u00f5es e os <strong>Operadores<\/strong> que as tornam funcionais.<\/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. Operadores Aritm\u00e9ticos e de Atribui\u00e7\u00e3o<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Estes operadores realizam c\u00e1lculos e modificam o valor das vari\u00e1veis.<\/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. Aritm\u00e9ticos<\/h3>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Operador<\/strong><\/td><td><strong>Nome<\/strong><\/td><td><strong>Fun\u00e7\u00e3o<\/strong><\/td><td><strong>Exemplo<\/strong><\/td><\/tr><\/thead><tbody><tr><td><code>+<\/code>, <code>-<\/code>, <code>*<\/code>, <code>\/<\/code><\/td><td>B\u00e1sico<\/td><td>Adi\u00e7\u00e3o, Subtra\u00e7\u00e3o, Multiplica\u00e7\u00e3o, Divis\u00e3o.<\/td><td><code>5 * 2<\/code><\/td><\/tr><tr><td><code>%<\/code><\/td><td>M\u00f3dulo<\/td><td>Retorna o <strong>resto<\/strong> da divis\u00e3o.<\/td><td><code>10 % 3<\/code> \u00e9 <code>1<\/code><\/td><\/tr><tr><td><code>**<\/code><\/td><td>Exponencia\u00e7\u00e3o<\/td><td>Eleva um n\u00famero \u00e0 pot\u00eancia de outro.<\/td><td><code>2 ** 3<\/code> \u00e9 <code>8<\/code><\/td><\/tr><tr><td><code>++<\/code>, <code>--<\/code><\/td><td>Incremento \/ Decremento<\/td><td>Adiciona ou subtrai 1. (Use com cuidado, preferindo <code>+= 1<\/code>).<\/td><td><code>x++<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\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. Atribui\u00e7\u00e3o Composta<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Estes operadores combinam uma opera\u00e7\u00e3o aritm\u00e9tica com a atribui\u00e7\u00e3o (<code>=<\/code>), tornando o c\u00f3digo mais conciso.<\/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>let x = 10;\nx += 5;   \/\/ \u00c9 o mesmo que: x = x + 5. (x agora \u00e9 15)\nx *= 2;   \/\/ \u00c9 o mesmo que: x = x * 2. (x agora \u00e9 30)\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. Operadores de Compara\u00e7\u00e3o e Igualdade<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Essenciais para estruturas de controle (<code>if<\/code>, <code>while<\/code>), estes operadores avaliam e retornam um valor <strong>Booleano<\/strong> (<code>true<\/code> ou <code>false<\/code>).<\/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. Igualdade Estrita vs. Fraca<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">\u00c9 crucial usar os operadores estritos para evitar <em>bugs<\/em> de coer\u00e7\u00e3o de tipos:<\/p>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Operador<\/strong><\/td><td><strong>Nome<\/strong><\/td><td><strong>Fun\u00e7\u00e3o<\/strong><\/td><td><strong>Coer\u00e7\u00e3o?<\/strong><\/td><td><strong>Exemplo<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong><code>===<\/code><\/strong><\/td><td>Igualdade Estrita<\/td><td>Compara <strong>Valor e Tipo<\/strong>.<\/td><td>N\u00e3o<\/td><td><code>10 === \"10\"<\/code> \u00e9 <strong><code>false<\/code><\/strong><\/td><\/tr><tr><td><strong><code>!==<\/code><\/strong><\/td><td>Desigualdade Estrita<\/td><td>Diferente em <strong>Valor ou Tipo<\/strong>.<\/td><td>N\u00e3o<\/td><td><code>10 !== \"10\"<\/code> \u00e9 <strong><code>true<\/code><\/strong><\/td><\/tr><tr><td><code>==<\/code><\/td><td>Igualdade Fraca<\/td><td>Compara <strong>Valor<\/strong> ap\u00f3s coer\u00e7\u00e3o de tipos.<\/td><td>Sim<\/td><td><code>10 == \"10\"<\/code> \u00e9 <strong><code>true<\/code><\/strong> (EVITAR!)<\/td><\/tr><\/tbody><\/table><\/figure>\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. Relacionais<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong><code>&lt;<\/code>, <code>><\/code>, <code>&lt;=<\/code>, <code>>=<\/code><\/strong>: Menor que, Maior que, Menor ou igual, Maior ou igual.<\/li>\n<\/ul>\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. Operadores L\u00f3gicos e Condicionais<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Utilizados para combinar ou inverter express\u00f5es Booleanas.<\/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. L\u00f3gicos<\/h3>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Operador<\/strong><\/td><td><strong>Nome<\/strong><\/td><td><strong>Fun\u00e7\u00e3o<\/strong><\/td><td><strong>Exemplo<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong><code>&amp;&amp;<\/code><\/strong><\/td><td>AND L\u00f3gico<\/td><td>Retorna <code>true<\/code> se <strong>ambas<\/strong> as express\u00f5es forem verdadeiras.<\/td><td><code>idade &gt; 18 &amp;&amp; temCNH<\/code><\/td><\/tr><tr><td>||<\/td><td>OR L\u00f3gico<\/td><td>Retorna <code>true<\/code> se <strong>alguma<\/strong> das express\u00f5es forem verdadeiras.<\/td><td><code>nota > 5 || nota &lt; 7<\/code><\/td><\/tr><tr><td><strong><code>!<\/code><\/strong><\/td><td>NOT L\u00f3gico<\/td><td>Inverte o valor Booleano.<\/td><td><code>!estaVazio<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\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. Operador Tern\u00e1rio (<code>? :<\/code>)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O operador condicional tern\u00e1rio \u00e9 uma <strong>express\u00e3o<\/strong> (retorna um valor) que age como uma vers\u00e3o concisa de um <em><code>if\/else<\/code><\/em>:<\/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>\/\/ Sintaxe: condi\u00e7\u00e3o ? valor_se_true : valor_se_false\n\nlet status = nota &gt;= 7 ? \"Aprovado\" : \"Reprovado\";\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\">4. Preced\u00eancia e Associatividade<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A <strong>preced\u00eancia<\/strong> determina a ordem em que os operadores s\u00e3o avaliados. Multiplica\u00e7\u00e3o e Divis\u00e3o (<code>*<\/code>, <code>\/<\/code>) t\u00eam preced\u00eancia maior que Adi\u00e7\u00e3o e Subtra\u00e7\u00e3o (<code>+<\/code>, <code>-<\/code>).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Par\u00eanteses:<\/strong> Use par\u00eanteses <code>()<\/code> para for\u00e7ar uma ordem de avalia\u00e7\u00e3o diferente.<\/li>\n<\/ul>\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>let resultado = 5 + 2 * 3;     \/\/ 2 * 3 \u00e9 avaliado primeiro: 5 + 6 = 11\nlet resultado2 = (5 + 2) * 3;  \/\/ (5 + 2) \u00e9 avaliado primeiro: 7 * 3 = 21\n<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A <strong>associatividade<\/strong> define a ordem de avalia\u00e7\u00e3o quando os operadores t\u00eam a mesma preced\u00eancia (geralmente da esquerda para a direita).<\/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\">\u2705 Conclus\u00e3o Express\u00f5es Javascript<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">As Express\u00f5es e seus Operadores s\u00e3o a <strong>linguagem de a\u00e7\u00e3o<\/strong> do JavaScript. Dominar a preced\u00eancia e, mais importante, o uso consistente dos operadores de <strong>igualdade estrita (<code>===<\/code>)<\/strong>, permite que voc\u00ea crie l\u00f3gica de programa previs\u00edvel e eficiente, que \u00e9 a base de qualquer aplica\u00e7\u00e3o robusta.<\/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>Express\u00f5es Javascript: Em JavaScript, tudo que pode ser avaliado para produzir um valor \u00e9 uma&#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-832","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>Express\u00f5es Javascript - BLOG THIAGO ROSSI<\/title>\n<meta name=\"description\" content=\"Express\u00f5es Javascript: Neste artigo, vamos explorar em detalhes o conceito de express\u00f5es em JavaScript, seus tipos e como utiliz\u00e1-las de ...\" \/>\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\/expressoes-javascript\/\" \/>\n<meta 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