{"id":852,"date":"2024-05-06T19:01:29","date_gmt":"2024-05-06T22:01:29","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=852"},"modified":"2025-11-13T21:13:27","modified_gmt":"2025-11-14T00:13:27","slug":"objetos-javascript","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/objetos-javascript\/","title":{"rendered":"Objetos 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>Objetos Javascript<\/strong>: Em JavaScript, os <strong>Objetos<\/strong> s\u00e3o a estrutura de dados mais fundamental e vers\u00e1til. Um objeto \u00e9 uma cole\u00e7\u00e3o din\u00e2mica de <strong>pares chave-valor<\/strong>, atuando como um cont\u00eainer que armazena dados (chamados <strong>Propriedades<\/strong>) e fun\u00e7\u00f5es (chamados <strong>M\u00e9todos<\/strong>).<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Objetos s\u00e3o o pilar da <strong>Programa\u00e7\u00e3o Orientada a Objetos<\/strong> em JS e, diferentemente dos Primitivos, eles s\u00e3o copiados por <strong>Refer\u00eancia<\/strong>, o que os torna mut\u00e1veis.<\/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. Cria\u00e7\u00e3o e Estrutura B\u00e1sica<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A maneira mais comum e direta de criar um objeto \u00e9 usando a sintaxe de <strong>Literal de Objeto<\/strong> (<code>{}<\/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. O Literal de Objeto<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Um objeto \u00e9 definido por chaves (<code>{}<\/code>) contendo propriedades separadas por v\u00edrgulas.<\/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>const livro = {\n  \/\/ Propriedade (Chave: Valor)\n  titulo: \"O Guia do Mochileiro\",\n  paginas: 42,\n  \n  \/\/ M\u00e9todo (Fun\u00e7\u00e3o associada ao objeto)\n  resumo: function() {\n    return `Livro: ${this.titulo}, com ${this.paginas} p\u00e1ginas.`;\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<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>Aten\u00e7\u00e3o ao <code>this<\/code>:<\/strong> Dentro de um m\u00e9todo, a palavra-chave <strong><code>this<\/code><\/strong> refere-se ao <strong>pr\u00f3prio objeto<\/strong> que est\u00e1 chamando o m\u00e9todo.<\/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. Acesso e Manipula\u00e7\u00e3o de Propriedades<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Existem duas formas principais de acessar ou modificar as propriedades de um 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\">A. Nota\u00e7\u00e3o de Ponto (Dot Notation)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">\u00c9 o m\u00e9todo preferido por ser mais limpo e r\u00e1pido, mas s\u00f3 funciona quando o nome da propriedade \u00e9 conhecido e <strong>n\u00e3o cont\u00e9m caracteres especiais<\/strong> (como espa\u00e7os ou h\u00edfens).<\/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(livro.titulo); \/\/ Acesso direto\nlivro.paginas = 43;        \/\/ Modifica\u00e7\u00e3o\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. Nota\u00e7\u00e3o de Colchetes (Bracket Notation)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">\u00c9 essencial quando:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li class=\"has-medium-font-size\">O nome da propriedade \u00e9 armazenado em uma <strong>vari\u00e1vel<\/strong>.<\/li>\n\n\n\n<li class=\"has-medium-font-size\">O nome da propriedade cont\u00e9m <strong>espa\u00e7os ou caracteres especiais<\/strong>.<\/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>let chave = \"titulo\";\nconsole.log(livro&#91;chave]); \/\/ Acesso din\u00e2mico usando a vari\u00e1vel 'chave'\n\nlivro&#91;\"data de lan\u00e7amento\"] = 1979; \/\/ Adicionando propriedade com espa\u00e7o\nconsole.log(livro&#91;\"data de lan\u00e7amento\"]);\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. Adicionar e Remover<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Adicionar\/Modificar:<\/strong> Atribua um valor \u00e0 chave, mesmo que ela n\u00e3o exista.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Remover:<\/strong> Use o operador <strong><code>delete<\/code><\/strong>.<\/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>livro.autor = \"Douglas Adams\"; \/\/ Adiciona a propriedade 'autor'\ndelete livro.paginas;          \/\/ Remove a propriedade 'paginas'\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. Estruturas Avan\u00e7adas de Objeto<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">A. Fun\u00e7\u00f5es Construtoras e Prot\u00f3tipos<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Antes do ES6, us\u00e1vamos <strong>Fun\u00e7\u00f5es Construtoras<\/strong> e o objeto <strong><code>prototype<\/code><\/strong> para criar &#8220;modelos&#8221; e herdar m\u00e9todos, permitindo a reutiliza\u00e7\u00e3o de c\u00f3digo entre inst\u00e2ncias.<\/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>function Personagem(nome) {\n  this.nome = nome;\n}\n\/\/ M\u00e9todo herdado por todas as inst\u00e2ncias\nPersonagem.prototype.falar = function() {\n  console.log(this.nome + \" diz oi!\");\n};\n\nconst goku = new Personagem(\"Goku\");\ngoku.falar();\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. Classes (ES6)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">As <strong>Classes<\/strong> introduzidas no ES6 s\u00e3o uma <strong>sintaxe simplificada<\/strong> (<em>syntactic sugar<\/em>) sobre o mecanismo de prot\u00f3tipos. Elas tornam a cria\u00e7\u00e3o de modelos de objeto e heran\u00e7a muito mais claras e intuitivas.<\/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>class Pessoa {\n  \/\/ Inicializador das propriedades\n  constructor(nome, idade) {\n    this.nome = nome;\n    this.idade = idade;\n  }\n  \n  \/\/ M\u00e9todo da Classe\n  apresentar() {\n    console.log(`Sou ${this.nome}.`);\n  }\n}\nconst maria = new Pessoa(\"Maria\", 25);\nmaria.apresentar();\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 Objetos Javascript<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Objetos Javascript: Os objetos s\u00e3o o elemento unificador da linguagem, permitindo modelar entidades complexas ao combinar <strong>dados (propriedades)<\/strong> e <strong>comportamentos (m\u00e9todos)<\/strong>. Dominar a cria\u00e7\u00e3o via <strong>Literal de Objeto<\/strong>, entender a diferen\u00e7a entre <strong>Nota\u00e7\u00e3o de Ponto vs. Colchetes<\/strong> e compreender a sintaxe moderna de <strong>Classes<\/strong> \u00e9 fundamental para desenvolver aplica\u00e7\u00f5es JavaScript robustas e orientadas a objetos.<\/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>Objetos Javascript: Em JavaScript, os Objetos s\u00e3o a estrutura de dados mais fundamental e vers\u00e1til&#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-852","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>Objetos Javascript - BLOG THIAGO ROSSI<\/title>\n<meta name=\"description\" content=\"Objetos Javascript: Neste artigo, vamos explorar a fundo os conceitos de objetos em JavaScript, desde sua cria\u00e7\u00e3o at\u00e9 a manipula\u00e7\u00e3o de suas..\" \/>\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\/objetos-javascript\/\" \/>\n<meta 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