{"id":824,"date":"2024-05-01T12:31:10","date_gmt":"2024-05-01T15:31:10","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=824"},"modified":"2025-11-13T10:20:02","modified_gmt":"2025-11-13T13:20:02","slug":"tipos-de-valores-javascript","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/tipos-de-valores-javascript\/","title":{"rendered":"Tipos de Valores 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>Tipos de Valores Javascript<\/strong>: O JavaScript \u00e9 uma linguagem de <strong>tipagem din\u00e2mica e fraca<\/strong>. Isso significa que voc\u00ea n\u00e3o declara o tipo da vari\u00e1vel, e o tipo de uma vari\u00e1vel pode mudar durante a execu\u00e7\u00e3o do programa. No entanto, todo <strong>valor<\/strong> em JS possui um tipo estrito.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Entender o sistema de tipos \u00e9 fundamental, pois define como os dados s\u00e3o armazenados, manipulados e comparados. Dividimos os tipos em duas grandes categorias: <strong>Primitivos (Imut\u00e1veis)<\/strong> e <strong>Objetos (Mut\u00e1veis)<\/strong>.<\/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. Tipos Primitivos (Imut\u00e1veis)<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Tipos primitivos representam valores \u00fanicos e s\u00e3o <strong>imut\u00e1veis<\/strong> (uma vez criados, seu valor n\u00e3o pode ser alterado, apenas a vari\u00e1vel pode ser reatribu\u00edda para apontar para um novo valor).<\/p>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Tipo<\/strong><\/td><td><strong>Descri\u00e7\u00e3o<\/strong><\/td><td><strong>Exemplo<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong><code>Number<\/code><\/strong><\/td><td>N\u00fameros inteiros e de ponto flutuante.<\/td><td><code>42<\/code>, <code>3.14<\/code>, <code>-10<\/code><\/td><\/tr><tr><td><strong><code>String<\/code><\/strong><\/td><td>Sequ\u00eancia de caracteres (texto).<\/td><td><code>\"Ol\u00e1, Mundo!\"<\/code>, <code>'JavaScript'<\/code><\/td><\/tr><tr><td><strong><code>Boolean<\/code><\/strong><\/td><td>Valores l\u00f3gicos: apenas <strong><code>true<\/code><\/strong> ou <strong><code>false<\/code><\/strong>.<\/td><td><code>true<\/code><\/td><\/tr><tr><td><strong><code>null<\/code><\/strong><\/td><td>Representa a <strong>aus\u00eancia intencional<\/strong> de qualquer valor.<\/td><td><code>let resultado = null;<\/code><\/td><\/tr><tr><td><strong><code>undefined<\/code><\/strong><\/td><td>Indica que uma vari\u00e1vel foi declarada, mas <strong>n\u00e3o foi atribu\u00edda<\/strong> (valor padr\u00e3o).<\/td><td><code>let variavel;<\/code><\/td><\/tr><tr><td><strong><code>Symbol<\/code><\/strong><\/td><td>Valor \u00fanico e imut\u00e1vel, usado para chaves de objeto. (Introduzido no ES6).<\/td><td><code>Symbol('chave unica')<\/code><\/td><\/tr><tr><td><strong><code>BigInt<\/code><\/strong><\/td><td>Representa n\u00fameros inteiros de precis\u00e3o arbitr\u00e1ria (al\u00e9m do limite do <code>Number<\/code>).<\/td><td><code>1234567890123456789n<\/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<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Imutabilidade Explicada:<\/strong> Se voc\u00ea tiver <code>let nome = \"Ana\";<\/code> e fizer <code>nome = nome + \" Silva\";<\/code>, voc\u00ea n\u00e3o alterou a <em>string<\/em> original <code>\"Ana\"<\/code>. Voc\u00ea criou uma <strong>nova<\/strong> <em>string<\/em> <code>\"Ana Silva\"<\/code> e fez a vari\u00e1vel <code>nome<\/code> apontar para ela.<\/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\">2. Tipo Objeto (Mut\u00e1vel)<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O <strong><code>Object<\/code><\/strong> \u00e9 o \u00fanico tipo estrutural em JavaScript. Objetos s\u00e3o cole\u00e7\u00f5es de pares chave-valor e s\u00e3o <strong>mut\u00e1veis<\/strong> (suas propriedades podem ser alteradas sem mudar a refer\u00eancia do objeto).<\/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\">Subtipos de Objeto<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Objetos Literais (Simples):<\/strong> Usados para agrupar dados e funcionalidades.<br><br>JavaScript<br><br><code>let livro = { titulo: \"O Poder do CSS\", autor: \"Thiago\", ano: 2024 }; \/\/ Mutabilidade: Podemos mudar a propriedade diretamente livro.ano = 2025;<\/code><br><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Arrays:<\/strong> Objetos especializados para armazenar cole\u00e7\u00f5es <strong>ordenadas<\/strong> de dados.<br><br>JavaScript<br><br><code>let cores = [\"azul\", \"verde\", \"amarelo\"]; <\/code><br><code>console.log(cores[0]); \/\/ azul<\/code><br><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Fun\u00e7\u00f5es:<\/strong> S\u00e3o objetos de &#8220;primeira classe&#8221;, pois podem ser armazenadas em vari\u00e1veis, passadas como argumentos e retornadas por outras fun\u00e7\u00f5es.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Date, RegExp, Map, Set:<\/strong> Objetos utilit\u00e1rios criados pelo JavaScript.<\/li>\n<\/ol>\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. Tipagem Din\u00e2mica e Coer\u00e7\u00e3o<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A <strong>tipagem din\u00e2mica<\/strong> \u00e9 a caracter\u00edstica que permite que o tipo de valor de uma vari\u00e1vel mude durante a execu\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 valor = 10;          \/\/ Tipo: Number\nvalor = \"Dez\";           \/\/ Tipo agora \u00e9 String\nvalor = true;            \/\/ Tipo agora \u00e9 Boolean\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\">\ud83d\udca1 Coer\u00e7\u00e3o de Tipos (Type Coercion)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O JavaScript costuma converter automaticamente os tipos de dados para que as opera\u00e7\u00f5es funcionem. Isso \u00e9 conhecido como <strong>coer\u00e7\u00e3o<\/strong> e \u00e9 uma fonte comum de bugs.<\/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>Tipo da Sa\u00edda<\/strong><\/td><td><strong>Explica\u00e7\u00e3o<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong><code>+<\/code> (Concatena\u00e7\u00e3o)<\/strong><\/td><td><code>\"10\" + 5<\/code><\/td><td><code>\"105\"<\/code><\/td><td>String<\/td><td>O JS coerceu <code>5<\/code> para <em>String<\/em>.<\/td><\/tr><tr><td><strong><code>+<\/code> (Adi\u00e7\u00e3o)<\/strong><\/td><td><code>\"10\" - 5<\/code><\/td><td><code>5<\/code><\/td><td>Number<\/td><td>O JS coerceu <code>\"10\"<\/code> para <em>Number<\/em>.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Para evitar coer\u00e7\u00e3o inesperada, use os operadores de <strong>igualdade estrita (<code>===<\/code>)<\/strong>, que comparam <strong>valor e tipo<\/strong> sem tentar converter.<\/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 (Coer\u00e7\u00e3o: JS converte \"10\" para 10)\nconsole.log(10 === \"10\"); \/\/ false (Estrito: Tipos s\u00e3o diferentes)\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 Tipos de Valores Javascript<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Dominar os tipos de valores em JavaScript vai al\u00e9m de saber seus nomes. \u00c9 entender a distin\u00e7\u00e3o crucial entre <strong>imutabilidade (Primitivos)<\/strong> e <strong>mutabilidade (Objetos)<\/strong>, e estar atento \u00e0 <strong>tipagem din\u00e2mica<\/strong> e aos perigos da <strong>coer\u00e7\u00e3o<\/strong>. Esse conhecimento \u00e9 a base para escrever l\u00f3gica previs\u00edvel e livre de <em>bugs<\/em>.<\/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>Tipos de Valores Javascript: O JavaScript \u00e9 uma linguagem de tipagem din\u00e2mica e fraca. Isso&#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-824","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>Tipos de Valores Javascript - BLOG THIAGO ROSSI<\/title>\n<meta name=\"description\" content=\"Tipos de Valores Javascript: Neste artigo, exploraremos os principais tipos de dados em JavaScript, suas caracter\u00edsticas e como utiliz\u00e1-los..\" \/>\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\/tipos-de-valores-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tipos de Valores Javascript - 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