{"id":26320,"date":"2017-02-17T10:29:58","date_gmt":"2017-02-17T10:29:58","guid":{"rendered":"https:\/\/dev.railscarma.com\/guide-converting-hash-struct-ruby\/"},"modified":"2021-06-05T12:52:38","modified_gmt":"2021-06-05T12:52:38","slug":"guide-konvertera-hash-struct-ruby","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/sv\/blogg\/tekniska-artiklar\/guide-konvertera-hash-struct-ruby\/","title":{"rendered":"En guide f\u00f6r att konvertera en hash till en struktur i Ruby"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"26320\" class=\"elementor elementor-26320\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3e12c92d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3e12c92d\" 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-610a0361\" data-id=\"610a0361\" 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-4b51e850 elementor-widget elementor-widget-text-editor\" data-id=\"4b51e850\" 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 align=\"justify\">Innan vi g\u00e5r djupare in i konverteringsprocessen, l\u00e5t oss alla f\u00f6rst identifiera skillnaden mellan de tv\u00e5 - hashen och strukturen. Detta kommer att l\u00e5ta oss hj\u00e4lpa till att svara p\u00e5 fr\u00e5gan varf\u00f6r vissa f\u00f6redrar att anv\u00e4nda struct \u00e4n hash i Ruby.<\/p>\n\n<h3>Att skilja Hash fr\u00e5n Struct<\/h3>\n<p align=\"justify\">Hash \u00e4r samlingen av nyckel-v\u00e4rdeparen och det \u00e4r samma sak med Arrayen, f\u00f6rutom det faktum att indexeringen gjordes genom godtyckliga nycklar f\u00f6r alla typer av objekt (inte heltalsindexet). En ordning d\u00e4r man korsar en hash efter v\u00e4rde eller nyckel kan tyckas godtycklig \u2013 och i allm\u00e4nhet inte vara i korsningsordningen. \u00c5 andra sidan \u00e4r struct den mer bekv\u00e4ma typen av s\u00e4tt att bunta samman antalet attribut. Detta \u00e4r genom \u00e5tkomstmetoderna utan att beh\u00f6va skriva explicita klasser.<\/p>\n<p align=\"justify\">Struct g\u00f6r att en instans kan genereras med en upps\u00e4ttning accessorer och det ser kraftfullt och bekv\u00e4mt ut f\u00f6r anv\u00e4ndaren. \u00c4ven om hasch kan g\u00f6ra liknande saker, \u00e4r det en kupp med n\u00e5gra fallgropar, som du kanske inte gillar. Struktur \u00e4r l\u00e4ttare att f\u00f6rst\u00e5, vilket kommer att leda anv\u00e4ndarna till en mer underh\u00e5llbar kodning. Dessutom \u00e4r det v\u00e4rt att notera att struct \u00f6vertr\u00e4ffar hash n\u00e4r det g\u00e4ller datah\u00e4mtningshastighet, vilket l\u00e5ter dig veta att struct kan vara ett b\u00e4ttre val j\u00e4mf\u00f6rt med hash f\u00f6r konfigurationen som beh\u00f6ver n\u00e5s p\u00e5 ett upprepat s\u00e4tt under k\u00f6rningen.<\/p>\n\n<h3>Konvertera Hash till Struct i Ruby<\/h3>\n<p align=\"justify\">Med det faktum att vi vet om de tv\u00e5 kanske m\u00e5nga f\u00f6redrar att anv\u00e4nda struct snarare \u00e4n hash. Men vad vi vill fokusera h\u00e4r \u00e4r att bakom den l\u00e5ga prestanda som ges av hash, kan de fortfarande bli f\u00f6rdelaktiga. Om du inte kan anv\u00e4nda den p\u00e5 sin egen lilla v\u00e4g, konvertera den till struktur s\u00e5 att b\u00e4ttre anv\u00e4ndbarhet kan uppn\u00e5s.<\/p>\n<p align=\"justify\">Om du redan har definierat strukturen och du ville initiera konvertering av hash till struktur, kan vi hj\u00e4lpa dig genom att anv\u00e4nda f\u00f6ljande metoder i ett givet exempel nedan. Om du ville konvertera har till en struct i Ruby, l\u00e5t oss till exempel s\u00e4ga att vi har en given av:<\/p>\n\n<pre><code>h = { :a =&gt; 1, :b =&gt; 2 } och vill ha en struktur som: sa == 1 sb == 2<\/code><\/pre>\nF\u00f6r att konvertera kan du g\u00f6ra n\u00e5gon av dessa metoder:\n<strong>Konverteringsmetod 1:<\/strong>\n\nP\u00e5 den h\u00e4r metoden kommer resultatet att se ut som OpenStruct och inte specifikt som struktur:\n<pre><code>pry(main)&gt; require &#039;ostruct&#039; pry(main)&gt; s = OpenStruct.new(h) =&gt; # pry(main)&gt; s\u00e4tter sa, sb 1 2<\/code><\/pre>\n<strong>Konverteringsmetod 2:<\/strong>\n\nOm du redan har definierat struct och vill starta n\u00e5got med en hash kan du f\u00f6lja detta:\n<pre><code>Person = Struct.new(:first_name, :last_name, :age) person_hash = { first_name: &quot;Foo&quot;, efternamn: &quot;Bar&quot;, \u00e5lder: 29 } person = Person.new(*person_hash.values_at(*Person.members) ) =&gt; #<\/code><\/pre>\n<strong>Konverteringsmetod 3: <\/strong>\n\nEftersom hash-nyckelordningen var garanterad i Ruby 1.9+ kan du f\u00f6lja detta:\n<pre><code>s = Struct.new(*(k = h.keys)).new(*h.values_at(*k))<\/code><\/pre>\nExemplet med hash to struct-konvertering som vi gav kan hj\u00e4lpa, men om du vill ha en mer omfattande id\u00e9, kom till proffs f\u00f6r formell hj\u00e4lp.\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<section class=\"elementor-section elementor-top-section elementor-element elementor-element-54bd0f38 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"54bd0f38\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\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-490299af\" data-id=\"490299af\" 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This will let us help answer the question why some prefer using the struct than hash in Ruby. Differentiating Hash from Struct Hash is the collection of the key-value pairs &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.railscarma.com\/sv\/blogg\/ruby-regex-match-guide-with-examples\/\"> <span class=\"screen-reader-text\">Ruby Regex Match Guide (2026) med exempel<\/span> L\u00e4s mer \u00bb<\/a><\/p>","protected":false},"author":1,"featured_media":31801,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[384],"tags":[],"class_list":["post-26320","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-articles"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A Guide on Converting a Hash to a Struct in Ruby - RailsCarma - Ruby on Rails Development Company specializing in Offshore Development<\/title>\n<meta name=\"description\" content=\"Before we get deeper in to the conversion process, let us all first identify the difference between the two \u2013 the hash and the struct. 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