{"id":844,"date":"2024-05-05T17:42:02","date_gmt":"2024-05-05T20:42:02","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=844"},"modified":"2025-11-13T12:03:32","modified_gmt":"2025-11-13T15:03:32","slug":"strings-no-javascript","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/strings-no-javascript\/","title":{"rendered":"Strings 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>Strings no Javascript<\/strong>: Em JavaScript, uma <strong>String<\/strong> \u00e9 um tipo de dado primitivo usado para armazenar e manipular sequ\u00eancias de caracteres (texto). Elas s\u00e3o indispens\u00e1veis para qualquer intera\u00e7\u00e3o com o usu\u00e1rio, desde exibir nomes at\u00e9 formatar <em>logs<\/em> e mensagens.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O conceito mais importante sobre <em>strings<\/em> em JS \u00e9 a sua <strong>imutabilidade<\/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. Cria\u00e7\u00e3o e Imutabilidade<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Uma <em>string<\/em> pode ser criada usando aspas simples (<code>'<\/code>), duplas (<code>\"<\/code>) ou <strong>crases (<code>`<\/code>)<\/strong>, sendo esta \u00faltima a mais poderosa.<\/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. Imutabilidade Explicada<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Strings s\u00e3o <strong>imut\u00e1veis<\/strong>. Isso significa que, uma vez que uma <em>string<\/em> \u00e9 criada, voc\u00ea <strong>n\u00e3o pode alterar seu conte\u00fado<\/strong>. Qualquer m\u00e9todo que pare\u00e7a modificar uma <em>string<\/em> (como <code>toUpperCase()<\/code> ou <code>replace()<\/code>) na verdade <strong>retorna uma nova <em>string<\/em><\/strong>, deixando a original intacta.<\/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 nome = \"jo\u00e3o\";\n\n\/\/ O m\u00e9todo retorna uma NOVA string\nlet nomeMaiusculo = nome.toUpperCase(); \n\nconsole.log(nome);         \/\/ \"jo\u00e3o\" (Original n\u00e3o mudou)\nconsole.log(nomeMaiusculo); \/\/ \"JO\u00c3O\" (Nova string)\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. Template Literals (Crase)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Introduzidos no ES6, os <em>Template Literals<\/em> s\u00e3o a forma moderna e mais flex\u00edvel de criar <em>strings<\/em>. Eles permitem:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Interpola\u00e7\u00e3o:<\/strong> Inserir vari\u00e1veis ou express\u00f5es diretamente na <em>string<\/em> usando a sintaxe <strong><code>${}<\/code><\/strong>.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Strings Multi-Linhas:<\/strong> Criar <em>strings<\/em> que quebram a linha no c\u00f3digo sem precisar de caracteres de escape (<code>\\n<\/code>).<\/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 produto = \"Caf\u00e9\";\nlet preco = 15.50;\n\nlet mensagem = `O ${produto} custa R$ ${preco.toFixed(2)}.`;\n\/\/ Sa\u00edda: O Caf\u00e9 custa R$ 15.50.\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. Acesso e Propriedades<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Strings se comportam como <em>arrays<\/em> de caracteres em termos de acesso, embora n\u00e3o sejam <em>arrays<\/em> de verdade.<\/p>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Caracter\u00edstica<\/strong><\/td><td><strong>Propriedade\/Sintaxe<\/strong><\/td><td><strong>Fun\u00e7\u00e3o<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Tamanho<\/strong><\/td><td><strong><code>.length<\/code><\/strong><\/td><td>Retorna o n\u00famero de caracteres.<\/td><\/tr><tr><td><strong>Acesso<\/strong><\/td><td><strong><code>[\u00edndice]<\/code><\/strong><\/td><td>Acessa o caractere na posi\u00e7\u00e3o (\u00edndice come\u00e7a em 0).<\/td><\/tr><\/tbody><\/table><\/figure>\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 palavra = \"JavaScript\";\nconsole.log(palavra.length); \/\/ 10\nconsole.log(palavra&#91;0]);    \/\/ \"J\"\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. M\u00e9todos Essenciais de Manipula\u00e7\u00e3o<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Strings possuem dezenas de m\u00e9todos. Estes s\u00e3o os mais utilizados:<\/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. Busca e Posi\u00e7\u00e3o<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong><code>indexOf(sub)<\/code>:<\/strong> Retorna o \u00edndice da <strong>primeira<\/strong> ocorr\u00eancia de uma substring (ou -1 se n\u00e3o for encontrada).<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong><code>includes(sub)<\/code>:<\/strong> Retorna <code>true<\/code> se a substring estiver presente.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong><code>startsWith() \/ endsWith()<\/code>:<\/strong> Retorna <code>true<\/code> se a <em>string<\/em> come\u00e7ar ou terminar com a substring.<\/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. Transforma\u00e7\u00e3o e Edi\u00e7\u00e3o<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong><code>toUpperCase() \/ toLowerCase()<\/code>:<\/strong> Converte toda a <em>string<\/em> para mai\u00fasculas ou min\u00fasculas.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong><code>trim()<\/code>:<\/strong> Remove espa\u00e7os em branco do <strong>in\u00edcio e do fim<\/strong> da <em>string<\/em>.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong><code>slice(start, end)<\/code>:<\/strong> Retorna uma <strong>nova <em>string<\/em><\/strong> extra\u00edda do \u00edndice <code>start<\/code> at\u00e9 (mas n\u00e3o incluindo) o \u00edndice <code>end<\/code>.<\/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 texto = \"  c\u00f3digo limpo  \";\nlet tratado = texto.trim().toUpperCase(); \/\/ \"C\u00d3DIGO LIMPO\"\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. Convers\u00e3o<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong><code>split(separador)<\/code>:<\/strong> Divide a <em>string<\/em> em um <strong>Array de substrings<\/strong>, usando o separador especificado.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong><code>replace(pattern, replacement)<\/code>:<\/strong> Retorna uma <strong>nova <em>string<\/em><\/strong> com a primeira ocorr\u00eancia do <code>pattern<\/code> substitu\u00edda.<\/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 tags = \"html,css,js\";\nlet arrayTags = tags.split(\",\"); \/\/ &#91;\"html\", \"css\", \"js\"]\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 Strings no Javascript<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Strings no Javascript: As <em>strings<\/em> s\u00e3o mais do que apenas cole\u00e7\u00f5es de texto. O entendimento de sua <strong>imutabilidade<\/strong>, o uso eficaz dos <strong>Template Literals<\/strong> para formata\u00e7\u00e3o limpa e o dom\u00ednio dos m\u00e9todos de manipula\u00e7\u00e3o e busca (<code>slice<\/code>, <code>trim<\/code>, <code>split<\/code>) s\u00e3o cruciais para qualquer desenvolvedor JavaScript. Elas s\u00e3o a ponte entre o seu c\u00f3digo e o usu\u00e1rio final.<\/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>Strings no Javascript: Em JavaScript, uma String \u00e9 um tipo de dado primitivo usado para&#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-844","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 - 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Minha trajet\u00f3ria passa pelo ensino t\u00e9cnico, desenvolvimento web, arquitetura de sistemas e cria\u00e7\u00e3o de solu\u00e7\u00f5es voltadas para a ind\u00fastria de jogos digitais. Acredito que conhecimento deve ser acess\u00edvel e aplic\u00e1vel. Essa vis\u00e3o resultou em uma biblioteca com mais de 550 artigos gratuitos, abrangendo temas como desenvolvimento web, infraestrutura, intelig\u00eancia artificial, Game Design, mercado de jogos e carreiras na ind\u00fastria de games. Sou autor do livro \"GDD \u2013 O Guia Definitivo\", uma obra dedicada ao planejamento e documenta\u00e7\u00e3o de jogos digitais, e criador do GameMeTRix, uma plataforma que auxilia desenvolvedores na an\u00e1lise e valida\u00e7\u00e3o de ideias para jogos. Meu trabalho busca conectar planejamento, tecnologia e mercado para ajudar criadores a transformar boas ideias em projetos vi\u00e1veis. Atualmente concentro meus estudos e projetos no desenvolvimento de jogos web, na cria\u00e7\u00e3o de metodologias para valida\u00e7\u00e3o de produtos digitais e na produ\u00e7\u00e3o de conte\u00fado t\u00e9cnico voltado ao ecossistema de jogos. Meu compromisso \u00e9 unir teoria, pr\u00e1tica e experi\u00eancia de mercado para contribuir com o crescimento de novos desenvolvedores e profissionais da \u00e1rea.","sameAs":["https:\/\/thiagorossi.com.br\/blog","https:\/\/instagram.com\/thiagorossix86"],"url":"https:\/\/thiagorossi.com.br\/blog\/author\/thiagorossi\/"}]}},"_links":{"self":[{"href":"https:\/\/thiagorossi.com.br\/blog\/wp-json\/wp\/v2\/posts\/844","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thiagorossi.com.br\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thiagorossi.com.br\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thiagorossi.com.br\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/thiagorossi.com.br\/blog\/wp-json\/wp\/v2\/comments?post=844"}],"version-history":[{"count":1,"href":"https:\/\/thiagorossi.com.br\/blog\/wp-json\/wp\/v2\/posts\/844\/revisions"}],"predecessor-version":[{"id":4636,"href":"https:\/\/thiagorossi.com.br\/blog\/wp-json\/wp\/v2\/posts\/844\/revisions\/4636"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/thiagorossi.com.br\/blog\/wp-json\/wp\/v2\/media\/804"}],"wp:attachment":[{"href":"https:\/\/thiagorossi.com.br\/blog\/wp-json\/wp\/v2\/media?parent=844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thiagorossi.com.br\/blog\/wp-json\/wp\/v2\/categories?post=844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thiagorossi.com.br\/blog\/wp-json\/wp\/v2\/tags?post=844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}