{"id":840,"date":"2024-05-05T16:52:22","date_gmt":"2024-05-05T19:52:22","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=840"},"modified":"2025-11-13T11:32:17","modified_gmt":"2025-11-13T14:32:17","slug":"condicionais-no-javascript","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/condicionais-no-javascript\/","title":{"rendered":"Condicionais 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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Condicionais no Javascript<\/strong>: Em qualquer programa, precisamos que o c\u00f3digo tome decis\u00f5es. As <strong>Estruturas Condicionais<\/strong> em JavaScript (como <code>if<\/code>, <code>else<\/code>, e <code>switch<\/code>) permitem que voc\u00ea execute diferentes blocos de c\u00f3digo dependendo se uma <strong>express\u00e3o Booleana<\/strong> \u00e9 avaliada como <code>true<\/code> ou <code>false<\/code>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Dominar as condicionais \u00e9 a chave para construir aplica\u00e7\u00f5es din\u00e2micas e interativas.<\/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. A Estrutura <code>if<\/code>, <code>else<\/code> e <code>else if<\/code><\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Esta \u00e9 a forma mais comum e flex\u00edvel de controle de fluxo, permitindo avaliar uma ou v\u00e1rias condi\u00e7\u00f5es em sequ\u00eancia.<\/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>if<\/code> (Se)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Executa um bloco de c\u00f3digo apenas se a condi\u00e7\u00e3o for verdadeira.<\/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 idade = 17;\n\nif (idade &gt;= 18) {\n  console.log(\"Acesso liberado.\"); \/\/ Esta linha \u00e9 ignorada\n}\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>if...else<\/code> (Se&#8230;Sen\u00e3o)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Garante que um dos dois blocos de c\u00f3digo ser\u00e1 executado.<\/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 numero = 5;\n\nif (numero % 2 === 0) {\n  console.log(\"O n\u00famero \u00e9 par.\");\n} else {\n  \/\/ Executado se o 'if' for falso\n  console.log(\"O n\u00famero \u00e9 \u00edmpar.\");\n}\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\">C. <code>else if<\/code> (Sen\u00e3o, se&#8230;)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Permite testar m\u00faltiplas condi\u00e7\u00f5es. O JavaScript testa cada condi\u00e7\u00e3o <strong>em ordem<\/strong> e executa o bloco do <strong>primeiro<\/strong> <code>if<\/code> ou <code>else if<\/code> que retornar <code>true<\/code>, ignorando o restante.<\/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 nota = 8.5;\n\nif (nota &gt;= 9) {\n  console.log(\"Aprovado com Excel\u00eancia.\");\n} else if (nota &gt;= 7) { \/\/ Apenas se o primeiro 'if' foi falso\n  console.log(\"Aprovado.\");\n} else {\n  console.log(\"Reprovado.\");\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. Estrutura <code>switch<\/code><\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A estrutura <code>switch<\/code> \u00e9 ideal quando voc\u00ea precisa comparar uma <strong>\u00fanica vari\u00e1vel\/express\u00e3o<\/strong> contra <strong>m\u00faltiplos valores fixos<\/strong> (casos). \u00c9 mais limpa que usar longas cadeias de <code>else if<\/code> para o mesmo 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>let diaDaSemana = 6; \/\/ 1 (Segunda) a 7 (Domingo)\n\nswitch (diaDaSemana) {\n  case 6: \/\/ Se diaDaSemana === 6\n  case 7: \/\/ OU se diaDaSemana === 7\n    console.log(\"Final de semana.\");\n    break; \/\/ Essencial! Interrompe a execu\u00e7\u00e3o\n  default:\n    console.log(\"Dia \u00fatil.\");\n}\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Aten\u00e7\u00e3o ao <code>break<\/code>:<\/strong> Sem o comando <strong><code>break<\/code><\/strong>, a execu\u00e7\u00e3o continua para o pr\u00f3ximo <code>case<\/code> ap\u00f3s encontrar uma correspond\u00eancia (<em>fall-through<\/em>), o que geralmente n\u00e3o \u00e9 o comportamento desejado.<\/p>\n<\/blockquote>\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. O Operador Tern\u00e1rio (<code>? :<\/code>)<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O <strong>Operador Tern\u00e1rio<\/strong> \u00e9 uma forma concisa de escrever uma condicional <code>if...else<\/code> em uma \u00fanica linha, e, o mais importante, \u00e9 uma <strong>Express\u00e3o<\/strong> (retorna um valor).<\/p>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Operador Tern\u00e1rio<\/strong><\/td><td><strong>Estrutura Equivalente<\/strong><\/td><\/tr><\/thead><tbody><tr><td><code>condi\u00e7\u00e3o ? valorSeVerdadeiro : valorSeFalso<\/code><\/td><td><code>if (condi\u00e7\u00e3o) { return valorSeVerdadeiro; } else { return valorSeFalso; }<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O Tern\u00e1rio deve ser usado quando voc\u00ea precisa <strong>atribuir um valor<\/strong> a uma vari\u00e1vel com base em uma condi\u00e7\u00e3o.<\/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 idade = 20;\n\n\/\/ O valor retornado \u00e9 'Maior de idade' ou 'Menor de idade'\nlet status = idade &gt;= 18 ? \"Maior de idade\" : \"Menor de idade\"; \n\nconsole.log(status); \/\/ Sa\u00edda: \"Maior de idade\"\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\">\u2728 Boas Pr\u00e1ticas em Condicionais<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Evite Aninhamento Excessivo:<\/strong> Muitas estruturas <code>if<\/code> dentro de outras (aninhamento profundo) dificultam a leitura. Nesses casos, prefira o <code>switch<\/code> ou use <strong>fun\u00e7\u00f5es<\/strong> para isolar a l\u00f3gica.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Sempre Use Chaves <code>{}<\/code>:<\/strong> Mesmo que seu bloco <code>if<\/code> tenha apenas uma linha, usar chaves evita erros e melhora a legibilidade.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Clareza vs. Consci\u00eancia:<\/strong> Use o <strong>Tern\u00e1rio<\/strong> para atribui\u00e7\u00f5es simples de uma linha; use o <strong><code>if\/else<\/code><\/strong> para blocos de c\u00f3digo mais longos ou complexos.<\/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\">\u2705 Conclus\u00e3o Condicionais no Javascript<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Condicionais no Javascript: As estruturas condicionais (<code>if\/else<\/code>, <code>else if<\/code>, <code>switch<\/code>) s\u00e3o o <strong>motor de decis\u00e3o<\/strong> da sua aplica\u00e7\u00e3o. Elas permitem que o c\u00f3digo responda a diferentes entradas e estados, garantindo dinamismo e flexibilidade. O dom\u00ednio dessas estruturas, juntamente com o uso inteligente do <strong>Operador Tern\u00e1rio<\/strong> para atribui\u00e7\u00f5es concisas, \u00e9 fundamental para escrever l\u00f3gica previs\u00edvel e construir a interatividade esperada em qualquer programa JavaScript.<\/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\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><\/p>\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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>Condicionais no Javascript: Em qualquer programa, precisamos que o c\u00f3digo tome decis\u00f5es. As Estruturas Condicionais&#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-840","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>Condicionais no Javascript - BLOG THIAGO ROSSI<\/title>\n<meta name=\"description\" content=\"Condicionais no Javascript: Neste artigo, vamos explorar as principais estruturas condicionais em JavaScript, como if, else if e switch, e...\" \/>\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\/condicionais-no-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Condicionais no Javascript - 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