{"id":38653,"date":"2024-11-20T05:35:09","date_gmt":"2024-11-20T05:35:09","guid":{"rendered":"https:\/\/www.railscarma.com\/?p=38653"},"modified":"2024-11-20T05:36:48","modified_gmt":"2024-11-20T05:36:48","slug":"la-guida-per-principianti-alla-dichiarazione-dei-casi-di-ruby","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/it\/blog\/la-guida-per-principianti-alla-dichiarazione-dei-casi-di-ruby\/","title":{"rendered":"La guida per principianti alla dichiarazione dei casi in Ruby"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"38653\" class=\"elementor elementor-38653\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a9882c7 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a9882c7\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ef570b1\" data-id=\"ef570b1\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-fecff75 elementor-widget elementor-widget-text-editor\" data-id=\"fecff75\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Il <\/span><span style=\"font-weight: 400;\">caso<\/span><span style=\"font-weight: 400;\"> in Ruby \u00e8 uno strumento versatile e potente per gestire condizioni multiple in un formato pulito e leggibile. Sia che siate principianti o che abbiate bisogno di un ripasso, questa guida vi illustrer\u00e0 i fondamenti di <\/span><span style=\"font-weight: 400;\">caso<\/span><span style=\"font-weight: 400;\"> con esempi pratici che ne rafforzano la comprensione.<\/span><\/p>\n<h2><b>Che cos'\u00e8 una dichiarazione di caso Ruby?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A <\/span><span style=\"font-weight: 400;\">caso<\/span><span style=\"font-weight: 400;\"> \u00e8 un'alternativa all'istruzione <\/span><span style=\"font-weight: 400;\">if-elsif-else<\/span><span style=\"font-weight: 400;\"> progettato per rendere il codice pi\u00f9 conciso e pi\u00f9 facile da leggere. Valuta un'espressione ed esegue il codice in base alle condizioni corrispondenti.<\/span><\/p>\n<h3><b>Sintassi di base<\/b><\/h3>\n<pre><span style=\"font-weight: 400;\">caso espressione\nquando condizione1<br><\/span><span style=\"font-weight: 400;\">&nbsp;&nbsp;# Codice da eseguire se la condizione1 \u00e8 vera<br><\/span><span style=\"font-weight: 400;\">quando condizione2<br><\/span><span style=\"font-weight: 400;\">&nbsp;&nbsp;# Codice da eseguire se la condizione2 \u00e8 vera<br><\/span><span style=\"font-weight: 400;\">altro<br><\/span><span style=\"font-weight: 400;\">&nbsp;&nbsp;# Codice da eseguire se nessuna condizione \u00e8 soddisfatta<br><\/span><span style=\"font-weight: 400;\">FINE<\/span><\/pre>\n<p><\/p>\n<h3><b>Esempio 1: Dichiarazione di un caso semplice<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">rubino<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">Copiare il codice<br><\/span><span style=\"font-weight: 400;\">giorno = \"luned\u00ec\"<br><\/span><span style=\"font-weight: 400;\">giorno del caso<br><\/span>quando \"Luned\u00ec\"\n mette \"Inizio della settimana lavorativa!\".\nquando \"Venerd\u00ec\"\n  mette \"Quasi fine settimana!\".\naltrimenti\n  mette \"Solo un altro giorno\".\nfine<\/pre>\n<p><\/p>\n<p><b>Produzione:<\/b><b><br><\/b><span style=\"font-weight: 400;\">Inizio della settimana lavorativa!<\/span><\/p>\n<p><\/p>\n<h3><b>Esempio 2: Utilizzo degli intervalli<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">\u00c8 possibile abbinare intervalli di valori all'interno di un <\/span><span style=\"font-weight: 400;\">caso<\/span><span style=\"font-weight: 400;\"> dichiarazione.<\/span><\/p>\n<pre>grado = 85\n\ngrado del caso\n\nquando 90..100\n\n  mette \"Eccellente\"\n\nquando 80..89\n\n  mette \"Buono\"\n\nquando 70..79\n\n  mette \"Media\"\n\naltrimenti\n\n  mette \"Da migliorare\"\n\nfine<\/pre>\n<p><\/p>\n<p><b>Produzione:<\/b><b><br><\/b><span style=\"font-weight: 400;\">Bene<\/span><\/p>\n<p><\/p>\n<h3><b>Esempio 3: Condizioni multiple in una singola riga<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Per semplicit\u00e0, combinare le condizioni con le virgole.<\/span><\/p>\n<pre>tempo = \"piovoso\"\n\ncaso meteo\n\nquando \"soleggiato\", \"parzialmente nuvoloso\"\n\n  mette \"Vai a fare una passeggiata!\"\n\nquando \"piovoso\", \"tempestoso\"\n\n  mette \"Rimani in casa\".\n\naltrimenti\n\n  mette \"Controllare le previsioni\".\n\nfine<\/pre>\n<p><\/p>\n<p><b>Produzione:<\/b><b><br><\/b><span style=\"font-weight: 400;\">Rimanete in casa.<\/span><\/p>\n<p><\/p>\n<h3><b>Esempio 4: Utilizzo di <\/b><b>caso<\/b><b> con <\/b><b>allora<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Per dichiarazioni pi\u00f9 brevi, utilizzare <\/span><span style=\"font-weight: 400;\">allora<\/span><span style=\"font-weight: 400;\"> per l'esecuzione in linea.<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">numero = 5<br><\/span><span style=\"font-weight: 400;\">numero del caso<br><\/span><span style=\"font-weight: 400;\">quando 1 allora mette \"Uno\"<br><\/span><span style=\"font-weight: 400;\">quando 5 allora mette \"Cinque\"<br><\/span><span style=\"font-weight: 400;\">else mette \"Altro numero\"<br><\/span><span style=\"font-weight: 400;\">FINE<\/span><\/pre>\n<p><\/p>\n<p><b>Produzione:<\/b><b><br><\/b><span style=\"font-weight: 400;\">Cinque<\/span><\/p>\n<p><\/p>\n<h3><b>Esempio 5: Corrispondenza dei modelli con <\/b><b>caso<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Introdotto in Ruby 2.7, il pattern matching aggiunge maggiore potenza a <\/span><span style=\"font-weight: 400;\">caso<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<pre>valore = [1, 2, 3]\n\ncaso valore\n\nin [1, _, _]\n\n  mette \"Inizia con 1\"\n\nin [_, _, 3]\n\n  mette \"Finisce con 3\"\n\naltrimenti\n\n  mette \"Schema diverso\"\n\nfine\n<\/pre>\n<p><\/p>\n<p><b>Produzione:<\/b><b><br><\/b><span style=\"font-weight: 400;\">Inizia con 1<\/span><\/p>\n<p><\/p>\n<h2><b>Quando usare una dichiarazione di caso in Ruby?<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Quando si hanno pi\u00f9 condizioni da valutare.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Per migliorare la leggibilit\u00e0 rispetto a <\/span><span style=\"font-weight: 400;\">if-elsif-else<\/span><span style=\"font-weight: 400;\">.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Quando si abbinano intervalli, matrici o schemi specifici.<\/span><\/li>\n<\/ul>\n<h3><b>Suggerimenti per padroneggiare le dichiarazioni sul caso<\/b><\/h3>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Mantenere la semplicit\u00e0<\/b><span style=\"font-weight: 400;\">: Evitare condizioni troppo complesse.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Utilizzare il valore predefinito (<\/b><b>altro<\/b><b>)<\/b><span style=\"font-weight: 400;\">: Prevedere sempre una condizione di ripiego.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Gamme e modelli di leva<\/b><span style=\"font-weight: 400;\">: Semplificate la logica con le funzionalit\u00e0 di Ruby per la corrispondenza dei range e dei pattern.<\/span><\/li>\n<\/ol>\n<h2><b>Conclusione<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Ruby's <\/span><span style=\"font-weight: 400;\">caso<\/span><span style=\"font-weight: 400;\"> \u00e8 una potente funzione che semplifica la gestione delle condizioni. Sia che stiate valutando semplici espressioni, intervalli o modelli, la padronanza dell'istruzione <\/span><span style=\"font-weight: 400;\">caso<\/span><span style=\"font-weight: 400;\"> migliorer\u00e0 le vostre capacit\u00e0 di programmazione in Ruby.&nbsp;<\/span><span style=\"font-size: 16px;\"><a href=\"https:\/\/www.railscarma.com\/it\">RailsCarma<\/a> fornisce un esperto <a href=\"https:\/\/www.railscarma.com\/it\/assumere-ruby-on-rails-sviluppatore\/\">Sviluppatori Ruby on Rails per fornire<\/a>r soluzioni scalabili e di alta qualit\u00e0, personalizzate in base alle esigenze specifiche del vostro progetto.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t  <div class=\"related-post slider\">\r\n        <div class=\"headline\">Articoli correlati<\/div>\r\n    <div class=\"post-list owl-carousel\">\r\n\r\n            <div class=\"item\">\r\n            <div class=\"thumb 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Sia che siate principianti o che abbiate bisogno di un ripasso, questa guida vi illustrer\u00e0 le basi dei case statement, con esempi pratici per consolidare la vostra comprensione. Che cos'\u00e8 una dichiarazione di caso in Ruby? Un caso ...<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.railscarma.com\/it\/blog\/how-to-build-a-scalable-saas-platform-using-ruby-on-rails\/\"> <span class=\"screen-reader-text\">Come costruire una piattaforma SaaS scalabile usando Ruby on Rails<\/span> Leggi altro \"<\/a><\/p>","protected":false},"author":5,"featured_media":38658,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1224],"tags":[],"class_list":["post-38653","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Beginner&#039;s Guide to Ruby Case Statement - RailsCarma<\/title>\n<meta name=\"description\" content=\"Learn the basics of Ruby case statement with this beginner&#039;s guide. 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