{"id":842,"date":"2024-05-05T17:00:11","date_gmt":"2024-05-05T20:00:11","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=842"},"modified":"2025-11-13T11:56:50","modified_gmt":"2025-11-13T14:56:50","slug":"arrays-no-javascript","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/arrays-no-javascript\/","title":{"rendered":"Arrays 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>Arrays no Javascript<\/strong>: Os <strong>Arrays<\/strong> s\u00e3o a estrutura de dados mais b\u00e1sica e crucial em JavaScript, permitindo armazenar cole\u00e7\u00f5es ordenadas de valores. Eles s\u00e3o como <strong>listas sequenciais<\/strong> onde cada elemento ocupa uma posi\u00e7\u00e3o definida por um <strong>\u00edndice num\u00e9rico<\/strong> que come\u00e7a em <strong>zero (<code>0<\/code>)<\/strong>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Embora Arrays sejam cole\u00e7\u00f5es, \u00e9 importante lembrar que em JavaScript, um <strong>Array \u00e9 um tipo especial de Objeto<\/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. Criando e Acessando Arrays<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A maneira mais comum e recomendada de criar um <em>array<\/em> \u00e9 usando a sintaxe de <strong>literal de <em>array<\/em><\/strong>.<\/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. Cria\u00e7\u00e3o e Propriedade <code>length<\/code><\/h3>\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>\/\/ Cria\u00e7\u00e3o por Literal (Recomendado)\nlet cores = &#91;\"vermelho\", \"verde\", \"azul\"];\n\n\/\/ Propriedade: Retorna o n\u00famero de elementos (n\u00e3o o \u00edndice)\nconsole.log(cores.length); \/\/ Sa\u00edda: 3\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. Acesso e Modifica\u00e7\u00e3o<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O acesso e a modifica\u00e7\u00e3o s\u00e3o feitos usando a <strong>nota\u00e7\u00e3o de colchetes <code>[]<\/code><\/strong> e o \u00edndice (posi\u00e7\u00e3o) do elemento.<\/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>\/\/ Acessando: \u00cdndices come\u00e7am em 0\nconsole.log(cores&#91;0]); \/\/ Sa\u00edda: \"vermelho\"\n\n\/\/ Modificando\ncores&#91;1] = \"amarelo\";\nconsole.log(cores); \/\/ Sa\u00edda: &#91;\"vermelho\", \"amarelo\", \"azul\"]\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. M\u00e9todos de Manipula\u00e7\u00e3o B\u00e1sica (Mut\u00e1veis)<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Esses m\u00e9todos alteram (<em>mutam<\/em>) o <em>array<\/em> original, modificando seu tamanho ou conte\u00fado.<\/p>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>M\u00e9todo<\/strong><\/td><td><strong>A\u00e7\u00e3o<\/strong><\/td><td><strong>Retorno<\/strong><\/td><td><strong>Exemplo<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong><code>push()<\/code><\/strong><\/td><td>Adiciona ao <strong>final<\/strong>.<\/td><td>Novo <code>length<\/code>.<\/td><td><code>cores.push(\"roxo\");<\/code><\/td><\/tr><tr><td><strong><code>pop()<\/code><\/strong><\/td><td>Remove do <strong>final<\/strong>.<\/td><td>O elemento removido.<\/td><td><code>let ultimo = cores.pop();<\/code><\/td><\/tr><tr><td><strong><code>unshift()<\/code><\/strong><\/td><td>Adiciona ao <strong>in\u00edcio<\/strong>.<\/td><td>Novo <code>length<\/code>.<\/td><td><code>cores.unshift(\"branco\");<\/code><\/td><\/tr><tr><td><strong><code>shift()<\/code><\/strong><\/td><td>Remove do <strong>in\u00edcio<\/strong>.<\/td><td>O elemento removido.<\/td><td><code>let primeiro = cores.shift();<\/code><\/td><\/tr><tr><td><strong><code>splice()<\/code><\/strong><\/td><td>Adiciona\/Remove em <strong>qualquer ponto<\/strong>.<\/td><td>Array de elementos removidos.<\/td><td><code>cores.splice(1, 1, \"ciano\");<\/code> (Remove 1 a partir do \u00edndice 1, e insere &#8220;ciano&#8221;)<\/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\">3. M\u00e9todos de Itera\u00e7\u00e3o e Transforma\u00e7\u00e3o (Imut\u00e1veis)<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Esses m\u00e9todos s\u00e3o cruciais no JavaScript moderno. Eles n\u00e3o alteram o <em>array<\/em> original, mas sim <strong>retornam um novo <em>array<\/em><\/strong> ou um novo resultado.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong><code>forEach()<\/code>:<\/strong> Executa uma fun\u00e7\u00e3o para cada elemento. N\u00e3o retorna um valor.<br>JavaScript<br><code>cores.forEach(function(cor) { <\/code><br>        <code>console.log(cor.toUpperCase()); <\/code><br><code>});<\/code><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong><code>map()<\/code>:<\/strong> Executa uma fun\u00e7\u00e3o para cada elemento e <strong>retorna um NOVO <em>array<\/em><\/strong> com os resultados da fun\u00e7\u00e3o.<br>JavaScript<br><code>const numeros = [1, 2, 3]; <\/code><br><code>const dobrados = numeros.map(n => n * 2); \/\/ [2, 4, 6]<\/code><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong><code>filter()<\/code>:<\/strong> Cria um <strong>NOVO <em>array<\/em><\/strong> contendo todos os elementos que passam em um teste l\u00f3gico.<br>JavaScript<br><code>const pares = numeros.filter(n => n % 2 === 0); \/\/ [2]<\/code><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong><code>find()<\/code> \/ <code>findIndex()<\/code>:<\/strong> Retorna o <strong>primeiro elemento<\/strong> ou o <strong>\u00edndice<\/strong> do primeiro elemento que satisfaz a condi\u00e7\u00e3o.<\/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\">4. M\u00e9todos N\u00e3o Mut\u00e1veis Comuns<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong><code>slice()<\/code>:<\/strong> Retorna uma <strong>c\u00f3pia rasa<\/strong> de uma parte do <em>array<\/em> (ou do <em>array<\/em> inteiro se n\u00e3o houver argumentos). N\u00e3o altera o original.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong><code>concat()<\/code>:<\/strong> Junta dois ou mais <em>arrays<\/em>, retornando um <strong>novo <em>array<\/em><\/strong> combinado.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong><code>join()<\/code>:<\/strong> Converte todos os elementos do <em>array<\/em> em uma <strong>String<\/strong>, usando um separador especificado.<\/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 nums = &#91;1, 2, 3].slice(1); \/\/ &#91;2, 3] (Original intacto)\nlet texto = cores.join(\" | \"); \/\/ \"vermelho | amarelo | azul\"\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 Arrays no Javascript<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Arrays no Javascript: Arrays s\u00e3o estruturas de dados vers\u00e1teis, essenciais para gerenciar cole\u00e7\u00f5es ordenadas. O dom\u00ednio dos m\u00e9todos de manipula\u00e7\u00e3o (<code>push<\/code>, <code>pop<\/code>, <code>splice<\/code>) e, principalmente, dos m\u00e9todos de itera\u00e7\u00e3o moderna (<code>map<\/code>, <code>filter<\/code>, <code>forEach<\/code>) \u00e9 o que diferencia um c\u00f3digo eficiente e funcional em JavaScript. Arrays, em conjunto com <em>loops<\/em>, formam a base do processamento de dados na <em>web<\/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>Arrays no Javascript: Os Arrays s\u00e3o a estrutura de dados mais b\u00e1sica e crucial em&#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-842","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 - 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