{"id":8538,"date":"2024-10-12T16:14:21","date_gmt":"2024-10-12T19:14:21","guid":{"rendered":"https:\/\/geekblogti.wpengine.com\/?p=8538"},"modified":"2024-11-19T15:45:33","modified_gmt":"2024-11-19T18:45:33","slug":"golang","status":"publish","type":"post","link":"https:\/\/www.geekhunter.com/pt/blog\/golang\/","title":{"rendered":"GoLang: uma introdu\u00e7\u00e3o"},"content":{"rendered":"\r\n<p class=\"wp-block-paragraph\"><em><strong>Go <\/strong><\/em>ou <em><strong>GoLang<\/strong><\/em>?\u00a0<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Golang \u00e9 uma linguagem criada por um grupo de engenheiros do Google<\/strong> por estarem insatisfeitos com as caracter\u00edsticas do C e de outras linguagens dispon\u00edveis que n\u00e3o ofereciam recursos necess\u00e1rios a alguns projetos da empresa.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Usar &#8220;<strong>Golang<\/strong>&#8221; facilita a pesquisa relacionada a essa linguagem.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Boa parte dos artigos no <em>medium <\/em>e respostas no <em>Stackoverflow <\/em>usa essa nomenclatura informal para evitar ambiguidade na indexa\u00e7\u00e3o em sites de busca.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">J\u00e1 que <em>Go <\/em>\u00e9 uma palavra em ingl\u00eas de uso comum ao contr\u00e1rio de <em>Python <\/em>e <em>Javascript<\/em>.\u00a0<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Al\u00e9m de Golang, a linguagem do Google, tamb\u00e9m existe o <strong><a href=\"https:\/\/geekblogti.wpengine.com\/introducao-ao-flutter-o-framework-do-google\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Flutter (abre numa nova aba)\">Flutter<\/a><\/strong>, o framework do Google.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Principalmente, para ter uma op\u00e7\u00e3o de linguagem de<strong> alto desempenho <\/strong>al\u00e9m do C que representa limita\u00e7\u00f5es que n\u00e3o s\u00e3o compat\u00edveis com necessidades mais modernas como:<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Concorr\u00eancia e evitar uso de gerenciamento de mem\u00f3ria em c\u00f3digo<\/strong>, por exemplo.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">E, para resolver a situa\u00e7\u00e3o de <strong>forma elegante e com bom desempenho<\/strong>, desenvolveram uma linguagem compilada com caracter\u00edsticas de uma linguagem interpretada e suporte <strong>simplificado a concorr\u00eancia<\/strong>.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Por que aprender GoLang?<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">O Go \u00e9 uma linguagem que foi escrita com <strong>alto desempenho <\/strong>em mente. O uso dela no YouTube e em outras plataformas criou uma redu\u00e7\u00e3o dr\u00e1stica no consumo de recursos nos servidores nos quais foi usada.\u00a0<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Tanto que hoje diversas empresas al\u00e9m do Google fazem o uso de Go, podendo ser citadas: Microsoft e Docker Inc.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">O software de containers Docker foi escrito em Go. A Azure, servi\u00e7o de cloud da Microsoft, tamb\u00e9m usa Go para o servi\u00e7o de container AKS.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Go tem uma perspectiva de crescimento enorme para os pr\u00f3ximos anos!<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Sendo que <strong><a href=\"https:\/\/geekblogti.wpengine.com\/hacks-e-dicas-como-ser-um-bom-programador\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"bons desenvolvedores (abre numa nova aba)\">bons desenvolvedores<\/a><\/strong> que possuem habilidades na linguagem est\u00e3o entre os mais requisitados, o que pode possibilitar a eles criarem c\u00f3digo para <strong>qualquer plataforma<\/strong>!<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Para que, dessa forma, voc\u00ea seja uma pessoa desenvolvedora <strong>vers\u00e1til e capacitada<\/strong> para atuar como <strong><a href=\"https:\/\/geekblogti.wpengine.com\/meus-desafios-e-evolucao-como-fullstack\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fullstack (abre numa nova aba)\">fullstack<\/a><\/strong>, por exemplo.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Na GeekHunter, voc\u00ea cria um perfil, conhece as oportunidades e recebe propostas alinhadas ao seu perfil. <\/strong><strong>S\u00e3o mais de 1000\u00a0<a href=\"http:\/\/bit.ly\/2RKh5Au\" target=\"_blank\" rel=\"noreferrer noopener\">vagas para desenvolvedores<\/a>\u00a0como voc\u00ea!<\/strong><\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Por onde come\u00e7ar? Instalando as depend\u00eancias, \u00e9 claro!<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">A instala\u00e7\u00e3o do compilador de Go, a princ\u00edpio, pode parecer assustadora, mas uma vez feita, voc\u00ea ter\u00e1 um canivete su\u00ed\u00e7o pronto em m\u00e3os.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Voc\u00ea ter\u00e1 ferramentas para lidar com o protocolo HTTP e outras tantas coisas j\u00e1 prontas nas bibliotecas padr\u00e3o da linguagem.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>1. O download dos arquivos b\u00e1sicos para Linux:<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code> $ wget -c https:\/\/dl.google.com\/go\/go1.12.4.linux-amd64.tar.gz <\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Isso vai salvar a vers\u00e3o 1.12.4 do Go no seu diret\u00f3rio atual (recomendo a raiz do usu\u00e1rio).<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>2. Basta extrair o arquivo usando o comando:<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code>$ sudo tar -C \/usr\/local -xzf go1.12.4.linux-amd64.tar.gz<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>3. Criando o diret\u00f3rio para o GOPATH:<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code>$ mkdir $HOME\/go<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>4. Quase pronto, faltam apenas as vari\u00e1veis de ambiente. <\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Para isso, adicione as seguintes linhas ao final do seu arquivo bashrc (ao menos no meu caso que uso Ubuntu com o shell padr\u00e3o):<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code> ` <br \/>  #CONFIGURA\u00c7\u00c3O DO GO <br \/> export PATH=$PATH:\/usr\/local\/go\/bin<br \/> export GOPATH=$HOME\/go<br \/> export PATH=$PATH:$GOPATH\/bin<br \/> `<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>5. Testando a instala\u00e7\u00e3o:<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code>$ go version<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Caso tudo tenha acontecido da maneira esperada o output ser\u00e1 parecido com isso:<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code>go version go1.12.4 linux\/amd64<\/code><\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Ol\u00e1, Gophers!<\/h2>\r\n\r\n\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Como n\u00e3o pode faltar, aqui vai um exemplo do tradicional <em>Hello World<\/em> escrito em GoLang:<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">&nbsp;<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">`<code>package main<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code> import \u201cfmt\u201d<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code> func main(){<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code>     fmt.Println(\u201cOl\u00e1 Gophers!\u201d) <\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code>}`<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Agora \u00e9 s\u00f3 salvar como <strong>hello_gophers.go<\/strong> entrar no diret\u00f3rio em que o c\u00f3digo fonte foi salvo e rodar com:<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code>go run hello_gophers.go<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Para ver o c\u00f3digo rodar, caso tenha interesse em compilar o arquivo para uma vers\u00e3o em bin\u00e1rio, basta rodar o comando go build:<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code>hello_gophers.go\r\n .\/hello_gophers<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">A explica\u00e7\u00e3o resumida do c\u00f3digo acima:<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Na linha 1, o Go est\u00e1 sendo informado em qual parte iniciar a execu\u00e7\u00e3o do c\u00f3digo fonte na linha 2 est\u00e1 sendo chamada a biblioteca fmt que significa formatted I\/O.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">A pr\u00f3pria documenta\u00e7\u00e3o caracteriza como sendo um an\u00e1logo as fun\u00e7\u00f5es printf e scanf do C.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Na linha 3 e 4 est\u00e1 sendo iniciada a fun\u00e7\u00e3o principal do c\u00f3digo (main) que n\u00e3o precisa de argumentos para iniciar e sendo chamada a fun\u00e7\u00e3o de output do terminal com a string \u201cOl\u00e1 Gophers!\u201d como \u00fanico argumento necess\u00e1rio.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Busca bin\u00e1ria com testes unit\u00e1rios para Golang<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">O algoritmo de busca bin\u00e1ria parte da premissa de que o array est\u00e1 ordenado, nesse caso ordem crescente.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code>`package main<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code>import \u201cfmt\u201d<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><code>func main(){<br \/> array := []int{0,1,2,3,4,5,6,7,8,9}<br \/> valor := 5<br \/> index := binaria(array, valor)<br \/> If index == -1{<br \/> fmt.Errorf(\u201cValor %v n\u00e3o encontrado\u201d, valor)<br \/> }<br \/> fmt.Println(\u201cValor %v encontrado no index %v\u201d, array[index], index )<br \/> }<br \/> func binaria(array, valor){<br \/> l := 0<br \/> h := len(array) - 1<br \/> for l &lt; h { medio := (h + l) \/ 2 If array[medio] == valor{ return medio } If array[medio] &gt; n {<br \/> h = m - 1<br \/> }<br \/> If array[medio] &lt; n {<br \/> l = m + 1<br \/> }<br \/> }<br \/> return -1<br \/> }`<\/code><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">O exemplo acima \u00e9 <strong>muito simples<\/strong> para n\u00e3o ficar apenas no exemplo do <em>Hello World.<\/em><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Listei pontos interessantes da sintaxe do Go:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Ao declarar vari\u00e1veis com um valor inicial usamos \u201c:=\u201d assim o compilador \u00e9 informado que precisa alocar espa\u00e7o em um endere\u00e7o de mem\u00f3ria para essa vari\u00e1vel com o valor do lado direito.<\/li>\r\n<li>O fmt.Errorf vai enviar para o terminal um erro informando que o valor requisitado n\u00e3o foi encontrado e o %v serve para inserir o valor da vari\u00e1vel no final chamada da fun\u00e7\u00e3o dentro da string.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">De outra forma, o c\u00f3digo continuaria sendo executado e Go <strong>n\u00e3o tem suporte a index negativo<\/strong>, diferente do python e outras linguagens nas quais isso retorna o \u00faltimo valor do array, em Go isso retorna um erro \u201cindex out of range\u201d.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Logo, essa \u00e9 a forma mais interessante de <strong>evitar problemas<\/strong> posteriormente<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Se o loop for na fun\u00e7\u00e3o bin\u00e1ria, ser\u00e1 interrompido assim que alcan\u00e7ar o return ou l se tornar maior ou igual a h, logo n\u00e3o \u00e9 necess\u00e1rio se preocupar com loop infinito nesse caso.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Al\u00e9m disso, os demais operadores usados s\u00e3o bastante comuns em outras linguagens como por exemplo:<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Operadores de compara\u00e7\u00e3o\u201c==\u201d, \u201c&lt;\u201d, \u201c&gt;\u201d<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Operadores aritm\u00e9ticos \u201c+\u201d, \u201c-\u201d, \u201c\/<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">O c\u00e9u n\u00e3o \u00e9 um limite para Golang!<\/h2>\r\n\r\n\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">E agora? <strong>Continuar aprendendo<\/strong> mais fazendo projetos cada vez maiores!<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Aqui v\u00e3o alguns lugares para conseguir materiais de <strong>estudo e suporte<\/strong> da comunidade:<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/gobyexample.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"GoByExamples (abre numa nova aba)\">GoByExamples<\/a><\/strong><br \/>Esse site tem uma lista de pequenos c\u00f3digos implementados em Go com explica\u00e7\u00e3o <strong>linha a linha<\/strong> do que est\u00e1 sendo feito neles.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>GoBlog<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">As not\u00edcias mais <strong>atuais <\/strong>sobre GoLang!<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/gowebexamples.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"GoWebExamples (abre numa nova aba)\">GoWebExamples<\/a><\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Nesse site tem v\u00e1rias implementa\u00e7\u00f5es de programas em Go <strong>voltados para Web<\/strong>, desde servidores at\u00e9 clientes web feitos em Go.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">N\u00e3o tem forma melhor de <strong>aprender <\/strong>do que vendo como os outros fazem para depois testar o c\u00f3digo linha por linha e ver o que acontece.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Pode parecer o caminho da pedras, mas considero <strong>muito divertido<\/strong>!<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Em outro artigo pretendo explicar a GoRoutines e outras caracter\u00edsticas da linguagem!<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">At\u00e9 a pr\u00f3xima!<\/p>\r\n\r\n\r\n\r\n\r\n","protected":false},"excerpt":{"rendered":"<p>Go ou GoLang?\u00a0 Golang \u00e9 uma linguagem criada por um grupo de engenheiros do Google por estarem insatisfeitos com as caracter\u00edsticas do C e de outras linguagens dispon\u00edveis que n\u00e3o ofereciam recursos necess\u00e1rios a alguns projetos da empresa. Usar &#8220;Golang&#8221; facilita a pesquisa relacionada a essa linguagem. Boa parte dos artigos no medium e respostas [&hellip;]<\/p>\n","protected":false},"author":167,"featured_media":8570,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[18],"tags":[],"class_list":["post-8538","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-desenvolvimiento-de-software"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.3 (Yoast SEO v28.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Golang: A Linguagem Criada pelo Google<\/title>\n<meta name=\"description\" content=\"Ser\u00e1 que Golang vale a pena? 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