{"id":155,"date":"2022-12-29T00:50:28","date_gmt":"2022-12-29T00:50:28","guid":{"rendered":"https:\/\/sawastudio.me\/blog\/?p=155"},"modified":"2022-12-29T00:59:10","modified_gmt":"2022-12-29T00:59:10","slug":"paradigmas-de-programacao-imperativo-e-declarativo","status":"publish","type":"post","link":"https:\/\/sawastudio.me\/blog\/index.php\/2022\/12\/29\/paradigmas-de-programacao-imperativo-e-declarativo\/","title":{"rendered":"Paradigmas de programa\u00e7\u00e3o &#8211; imperativo e declarativo"},"content":{"rendered":"\n<p>Ol\u00e1!! ~ \ud83d\ude42 <\/p>\n\n\n\n<p><a href=\"https:\/\/sawastudio.me\/blog\/index.php\/2022\/12\/26\/paradigmas-de-programacao\/\">No post passado<\/a>, tivemos um vislumbre te\u00f3rico sobre os paradigmas de programa\u00e7\u00e3o e hoje vamos abordar a diferen\u00e7a entre os principais paradigmas: <strong>imperativo<\/strong> e <strong>declarativo<\/strong>. Apenas recapitulando, paradigmas de programa\u00e7\u00e3o s\u00e3o padr\u00f5es de como algo deve ser desenvolvido. <\/p>\n\n\n\n<p>Dos paradigmas imperativo e declarativo nascem v\u00e1rios tipos de programa\u00e7\u00e3o, como descrito no diagrama abaixo (o mesmo do post anterior, s\u00f3 que mais expandido):<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"891\" height=\"700\" src=\"https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/Group-80-1-1.png\" alt=\"\" class=\"wp-image-159\" srcset=\"https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/Group-80-1-1.png 891w, https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/Group-80-1-1-300x236.png 300w, https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/Group-80-1-1-768x603.png 768w\" sizes=\"auto, (max-width: 891px) 100vw, 891px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">&#8220;O qu\u00ea&#8221; vs &#8220;como&#8221;<\/h3>\n\n\n\n<p>O paradigma imperativo costuma focar no <strong>como<\/strong> algo ser\u00e1 feito, enquanto o paradigma declarativo foca no<strong> o qu\u00ea<\/strong> ser\u00e1 feito. Imagine que os dois s\u00e3o seus filhos e voc\u00ea precisa que eles v\u00e3o no mercado comprar algo para voc\u00ea. <\/p>\n\n\n\n<p>Para o filho <strong>imperativo<\/strong>, voc\u00ea instrui da seguinte forma: &#8220;<em>filho, pegue esse dinheiro, abra a porta, saia, feche a porta, v\u00e1 at\u00e9 o port\u00e3o, abra, saia para a rua, feche o port\u00e3o, ande at\u00e9 o mercado, entre l\u00e1, v\u00e1 at\u00e9 a se\u00e7\u00e3o de ovos, pegue uma caixa de uma d\u00fazia&#8230;<\/em>&#8221; &#8211; enfim, todo o passo a passo.<\/p>\n\n\n\n<p>Para o filho <strong>declarativo<\/strong>, voc\u00ea instrui assim: &#8220;<em>filho, v\u00e1 ao mercado e traga 12 ovos.<\/em>&#8220;<\/p>\n\n\n\n<p>Ao programar com um paradigma imperativo, voc\u00ea descreve <strong>como<\/strong> cada passo ser\u00e1 realizado. J\u00e1 um c\u00f3digo declarativo, voc\u00ea s\u00f3 precisa dizer <strong>o que<\/strong> quer. Uma query do MySQL \u00e9 um \u00f3timo exemplo de express\u00e3o declarativa. Por exemplo: <\/p>\n\n\n\n<p><code>SELECT * from clientes WHERE cadastro = ativo;<\/code><\/p>\n\n\n\n<p>Aqui, apenas foi pedido <strong>o que<\/strong> queremos: ver todos os clientes ativos. Mas <strong>como<\/strong> o banco far\u00e1 essa busca? Ele vai ler linha por linha no banco e ir verificando com um if\/else se o valor da coluna cadastro \u00e9 &#8220;ativo&#8221;? Se fosse uma linguagem do paradigma imperativo, seria necess\u00e1rio descrever todos esses passos. Como \u00e9 declarativo, n\u00e3o sabemos <strong>como<\/strong> o banco faz essa busca, n\u00e3o \u00e9 o foco do paradigma.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Olhando o c\u00f3digo<\/h3>\n\n\n\n<p>Confesso que \u00e9 um pouco desafiador mostrar o qu\u00e3o diferente os dois paradigmas s\u00e3o na pr\u00e1tica com apenas alguns pequenos trechos de c\u00f3digo aqui, em cen\u00e1rios mais complexos \u00e9 muito mais f\u00e1cil de visualizar; quando h\u00e1 demanda de reuso de c\u00f3digo e etc. <\/p>\n\n\n\n<p>Por\u00e9m, vamos utilizar o exemplo anterior e ver como seria um c\u00f3digo de filtro de array simples em javascript (que \u00e9 multi-paradigma) no modo imperativo e depois no modo declarativo:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"818\" src=\"https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/co\u0301digo-imperativo-2-1024x818.png\" alt=\"\" class=\"wp-image-163\" srcset=\"https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/co\u0301digo-imperativo-2-1024x818.png 1024w, https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/co\u0301digo-imperativo-2-300x240.png 300w, https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/co\u0301digo-imperativo-2-768x614.png 768w, https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/co\u0301digo-imperativo-2.png 1374w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"483\" src=\"https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/co\u0301digo-declarativo-1-1024x483.png\" alt=\"\" class=\"wp-image-162\" srcset=\"https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/co\u0301digo-declarativo-1-1024x483.png 1024w, https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/co\u0301digo-declarativo-1-300x141.png 300w, https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/co\u0301digo-declarativo-1-768x362.png 768w, https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/co\u0301digo-declarativo-1.png 1374w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Observe que no c\u00f3digo imperativo, foi descrito um passo a passo de como a busca deveria ser feita e no c\u00f3digo declarativo, apenas \u00e9 dito o que \u00e9 para ser feito: &#8220;<em>filtra a\u00ed os que s\u00e3o ativos<\/em>&#8220;. <\/p>\n\n\n\n<p>Assim, o<strong> paradigma imperativo<\/strong> normalmente possui <strong>mais c\u00f3digo<\/strong> do que o <strong>declarativo<\/strong>, que \u00e9 <strong>menos expl\u00edcito<\/strong> do que o imperativo. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">C\u00f3digos imperativos e performance<\/h3>\n\n\n\n<p>&#8220;<em>Sawa, ent\u00e3o o c\u00f3digos do paradigma imperativo s\u00e3o bem maiores que os c\u00f3digos declarativos. Como ele gasta menos energia e \u00e9 mais perform\u00e1tico do que o declarativo? N\u00e3o faz sentido algum!<\/em>&#8221; &#8211; Talvez voc\u00ea me questione, ao se lembrar da <a href=\"https:\/\/sawastudio.me\/blog\/index.php\/2022\/12\/26\/paradigmas-de-programacao\/\">tabela de energia de cada paradigma do post anterior<\/a>. \u00c9 um questionamento v\u00e1lido, mas o princ\u00edpio \u00e9 simples: mais trabalho para voc\u00ea, menos trabalho para a m\u00e1quina ;). <\/p>\n\n\n\n<p>Programa\u00e7\u00e3o imperativa, querendo ou n\u00e3o, \u00e9 o pilar da computa\u00e7\u00e3o e \u00e9 como a CPU trabalha primariamente. Ent\u00e3o, os c\u00f3digos nesse padr\u00e3o, s\u00e3o mais pr\u00f3ximos das m\u00e1quinas. Por\u00e9m, com o avan\u00e7o de hardware ao longo dos anos, essa diferen\u00e7a vai ficando cada vez mais insignificante. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Principais diferen\u00e7as<\/h3>\n\n\n\n<p>At\u00e9 agora entendemos que o paradigma imperativo implica em c\u00f3digos que d\u00e3o uma vis\u00e3o bem concreta para a m\u00e1quina sobre como ela deve executar, enquanto que o paradigma declarativo envolve c\u00f3digos mais sombrios por\u00e9m mais &#8220;enxugados&#8221;.  Vamos dar uma pontuada nas outras diferen\u00e7as principais entre ambos os paradigmas.<\/p>\n\n\n\n<p>Para facilitar, observe a lista geral de diferen\u00e7as abaixo:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"891\" height=\"702\" src=\"https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/Group-82-1.png\" alt=\"\" class=\"wp-image-165\" srcset=\"https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/Group-82-1.png 891w, https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/Group-82-1-300x236.png 300w, https:\/\/sawastudio.me\/blog\/wp-content\/uploads\/2022\/12\/Group-82-1-768x605.png 768w\" sizes=\"auto, (max-width: 891px) 100vw, 891px\" \/><\/figure>\n\n\n\n<p>Uma forma pr\u00e1tica para entender ainda melhor a diferen\u00e7a de ambos os paradigmas, \u00e9 entendendo e utilizando seus sub-paradigmas. <\/p>\n\n\n\n<p>Nos pr\u00f3ximos posts, vamos entrar mais a fundo na <strong>programa\u00e7\u00e3o funcional<\/strong> (do <strong>paradigma declarativo<\/strong>) e na <strong>programa\u00e7\u00e3o orientada a objetos<\/strong> (<strong>paradigma imperativo<\/strong>). <\/p>\n\n\n\n<p>Obrigada por chegar at\u00e9 aqui~! <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ol\u00e1!! ~ \ud83d\ude42 No post passado, tivemos um vislumbre te\u00f3rico sobre os paradigmas de programa\u00e7\u00e3o e hoje vamos abordar a diferen\u00e7a entre os principais paradigmas: imperativo e declarativo. Apenas recapitulando, paradigmas de programa\u00e7\u00e3o s\u00e3o padr\u00f5es de como algo deve ser desenvolvido. Dos paradigmas imperativo e declarativo nascem v\u00e1rios tipos de programa\u00e7\u00e3o, como descrito no diagrama&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-155","post","type-post","status-publish","format-standard","hentry","category-programacao"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Paradigmas de programa\u00e7\u00e3o - imperativo e declarativo - Sawa Studio - Blog<\/title>\n<meta name=\"description\" content=\"O paradigma imperativo costuma focar no como algo ser\u00e1 feito, enquanto o paradigma declarativo foca no o qu\u00ea ser\u00e1 feito. 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