{"id":834,"date":"2024-05-05T15:46:55","date_gmt":"2024-05-05T18:46:55","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=834"},"modified":"2025-11-13T10:58:26","modified_gmt":"2025-11-13T13:58:26","slug":"operadores-no-javascript","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/operadores-no-javascript\/","title":{"rendered":"Operadores no 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>Operadores no Javascript<\/strong>: Em JavaScript, os <strong>operadores<\/strong> s\u00e3o s\u00edmbolos especiais que permitem realizar c\u00e1lculos, atribuir valores, e, crucialmente, comparar dados. Eles s\u00e3o a &#8220;cola&#8221; que conecta vari\u00e1veis e valores, dando vida \u00e0 l\u00f3gica do seu programa.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Neste artigo, exploramos os principais tipos de operadores e as melhores pr\u00e1ticas para utiliz\u00e1-los de forma eficaz.<\/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 manipulam valores num\u00e9ricos, sendo a base de qualquer c\u00e1lculo.<\/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<p class=\"has-medium-font-size wp-block-paragraph\">Al\u00e9m das quatro opera\u00e7\u00f5es b\u00e1sicas (<code>+<\/code>, <code>-<\/code>, <code>*<\/code>, <code>\/<\/code>), destacam-se:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>M\u00f3dulo (<code>%<\/code>):<\/strong> Retorna o <strong>resto<\/strong> da divis\u00e3o. \u00datil para verificar se um n\u00famero \u00e9 par ou \u00edmpar.JavaScript<code>let resto = 10 % 3; \/\/ 1<\/code><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Incremento\/Decremento (<code>++<\/code>, <code>--<\/code>):<\/strong> Adiciona ou subtrai 1.JavaScript<code>let contador = 5; contador++; \/\/ 6<\/code><\/li>\n<\/ul>\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\">Eles combinam uma opera\u00e7\u00e3o aritm\u00e9tica com a atribui\u00e7\u00e3o simples (<code>=<\/code>), economizando c\u00f3digo.<\/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>Equivalente a&#8230;<\/strong><\/td><td><strong>Exemplo<\/strong><\/td><td><strong>Valor Resultante<\/strong><\/td><\/tr><\/thead><tbody><tr><td><code>+=<\/code><\/td><td><code>a = a + b<\/code><\/td><td><code>let a = 5; a += 3;<\/code><\/td><td><code>a<\/code> agora \u00e9 <code>8<\/code><\/td><\/tr><tr><td><code>-=<\/code><\/td><td><code>a = a - b<\/code><\/td><td><code>let a = 5; a -= 3;<\/code><\/td><td><code>a<\/code> agora \u00e9 <code>2<\/code><\/td><\/tr><tr><td><code>**=<\/code><\/td><td><code>a = a ** b<\/code><\/td><td><code>let a = 2; a **= 3;<\/code><\/td><td><code>a<\/code> agora \u00e9 <code>8<\/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<h2 class=\"wp-block-heading has-large-font-size\">2. Operadores de Compara\u00e7\u00e3o: A Regra do <code>===<\/code><\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Operadores de compara\u00e7\u00e3o retornam sempre um valor <strong>Booleano<\/strong> (<code>true<\/code> ou <code>false<\/code>). O mais importante \u00e9 entender a diferen\u00e7a entre igualdade fraca e estrita.<\/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\">\ud83d\udea8 Igualdade Estrita (<code>===<\/code> e <code>!==<\/code>)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Estes operadores comparam <strong>o valor E o tipo<\/strong> do dado. Eles n\u00e3o tentam realizar <em>coer\u00e7\u00e3o de tipos<\/em> e s\u00e3o a <strong>pr\u00e1tica recomendada<\/strong> em JavaScript:<\/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>Exemplo<\/strong><\/td><td><strong>Resultado<\/strong><\/td><td><strong>Explica\u00e7\u00e3o<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong><code>===<\/code><\/strong><\/td><td><code>10 === \"10\"<\/code><\/td><td><code>false<\/code><\/td><td>Os valores s\u00e3o iguais, mas os <strong>tipos<\/strong> (Number vs. String) s\u00e3o diferentes.<\/td><\/tr><tr><td><strong><code>!==<\/code><\/strong><\/td><td><code>10 !== 10<\/code><\/td><td><code>false<\/code><\/td><td>Valor e tipo s\u00e3o iguais (s\u00e3o ambos Number).<\/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\">Igualdade Fraca (<code>==<\/code> e <code>!=<\/code>)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Estes operadores tentam converter os tipos (coer\u00e7\u00e3o) antes de comparar, levando a resultados inesperados:<\/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>console.log(10 == \"10\"); \/\/ true (O JS converte \"10\" para o n\u00famero 10)\nconsole.log(null == undefined); \/\/ true (Regra espec\u00edfica do JS)\n\/\/ EVITE USAR ESTES OPERADORES.\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\">Operadores Relacionais<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><code>><\/code>, <code>&lt;<\/code>, <code>>=<\/code>, <code>&lt;=<\/code>: Compara\u00e7\u00e3o de ordem de grandeza.<\/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 Tern\u00e1rio<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Estes operadores permitem combinar ou inverter express\u00f5es booleanas, controlando o fluxo do programa.<\/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>E (AND)<\/td><td>Retorna <code>true<\/code> se <strong>TODAS<\/strong> as express\u00f5es forem verdadeiras.<\/td><td><code>logado &amp;&amp; isAdmin<\/code><\/td><\/tr><tr><td>||<\/td><td>OU (OR)<\/td><td>Retorna <code>true<\/code> se <strong>ALGUMA<\/strong> das express\u00f5es forem verdadeiras.<\/td><td><code>logado || is<\/code>USer<\/td><\/tr><tr><td><strong><code>!<\/code><\/strong><\/td><td>Nega\u00e7\u00e3o (NOT)<\/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\">\u00c9 uma forma concisa de escrever uma express\u00e3o <code>if\/else<\/code> que retorna um valor:<\/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_verdadeiro : valor_se_falso\nlet status = idade &gt;= 18 ? \"Adulto\" : \"Menor\"; \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 de Operadores<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A <strong>preced\u00eancia<\/strong> define a ordem de avalia\u00e7\u00e3o das opera\u00e7\u00f5es em uma express\u00e3o.<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Par\u00eanteses <code>()<\/code><\/strong> t\u00eam a maior preced\u00eancia (sempre s\u00e3o avaliados primeiro).<\/li>\n\n\n\n<li class=\"has-medium-font-size\">Operadores Aritm\u00e9ticos (Ex: <code>*<\/code>, <code>\/<\/code> antes de <code>+<\/code>, <code>-<\/code>).<\/li>\n\n\n\n<li class=\"has-medium-font-size\">Operadores de Compara\u00e7\u00e3o.<\/li>\n\n\n\n<li class=\"has-medium-font-size\">Operadores L\u00f3gicos (<code>&amp;&amp;<\/code> antes de <code>||<\/code>).<\/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>\/\/ A multiplica\u00e7\u00e3o \u00e9 feita primeiro (2 * 5 = 10)\nlet resultado = 3 + 2 * 5; \/\/ 13\n\n\/\/ O par\u00eantese for\u00e7a a soma a ser feita primeiro (3 + 2 = 5)\nlet resultado2 = (3 + 2) * 5; \/\/ 25\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 Operadores no Javascript<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Os operadores s\u00e3o as ferramentas essenciais para construir a l\u00f3gica em JavaScript. O conhecimento mais valioso \u00e9 o uso disciplinado dos operadores de <strong>igualdade estrita (<code>===<\/code> e <code>!==<\/code>)<\/strong> para prevenir <em>bugs<\/em> de coer\u00e7\u00e3o, e o dom\u00ednio dos operadores l\u00f3gicos para o controle de fluxo.<\/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>Operadores no Javascript: Em JavaScript, os operadores s\u00e3o s\u00edmbolos especiais que permitem realizar c\u00e1lculos, atribuir&#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-834","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 v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Operadores no Javascript - BLOG THIAGO ROSSI<\/title>\n<meta name=\"description\" content=\"Operadores no Javascript: Neste artigo, vamos explorar os principais tipos de operadores em JavaScript, suas funcionalidades e como ...\" \/>\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\/operadores-no-javascript\/\" \/>\n<meta property=\"og:locale\" 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