{"id":30336,"date":"2023-01-14T14:40:27","date_gmt":"2023-01-14T09:10:27","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-are-swift-dictionaries-automatically-sorted\/"},"modified":"2023-01-14T14:40:27","modified_gmt":"2023-01-14T09:10:27","slug":"solved-are-swift-dictionaries-automatically-sorted","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-are-swift-dictionaries-automatically-sorted\/","title":{"rendered":"[Solved] Are Swift dictionaries automatically sorted?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-37295812\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"37295812\" data-parentid=\"37295264\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>Swift&#8217;s <code>Dictionary<\/code> is a hash-based data structure. Unless a specific ordering mechanism is in place, the order of items in hash-based structures depends on several factors:<\/p>\n<ul>\n<li><strong>Hash values of objects used as keys<\/strong> &#8211; <code>hashValue<\/code> method is used to determine the bucket number for the item<\/li>\n<li><strong>Size of the structure<\/strong> &#8211; Since <code>hashValue<\/code> can be much larger than the number of buckets available, a limiting mechanism, such as modulo bucket count, is used to decide the actual bucket number<\/li>\n<li><strong>Modification order<\/strong> &#8211; this becomes relevant when keys have collisions. Elements with duplicate hash value placed later would either go to a different bucket, or be placed in a list associated with the actual bucket.<\/li>\n<\/ul>\n<p>For example, if you change the size of dictionary in your second example, the order of items would reverse:<\/p>\n<pre><code>var test1 = [String:String]() \/\/ Use default initial capacity\ntest1[\"Tomorrow\"] = \"Bla\"\ntest1[\"One Month\"] = \"Bla\"\nprint(test1) \/\/ [\"One Month\": \"Bla\", \"Tomorrow\": \"Bla\"]\n\nvar test2 = [String:String](minimumCapacity: 11) \/\/ Use specific capacity\ntest2[\"Tomorrow\"] = \"Bla\"\ntest2[\"One Month\"] = \"Bla\"\nprint(test2) \/\/ [\"Tomorrow\": \"Bla\", \"One Month\": \"Bla\"]\n<\/code><\/pre>\n<p>Since some of these parameters are outside your control, the order of items in a <code>Dictionary<\/code> can be considered arbitrary for all practical purposes.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">1<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Are Swift dictionaries automatically sorted? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Swift&#8217;s Dictionary is a hash-based data structure. Unless a specific ordering mechanism is in place, the order of items in hash-based structures depends on several factors: Hash values of objects used as keys &#8211; hashValue method is used to determine the bucket number for the item Size of the structure &#8211; Since hashValue can &#8230; <a title=\"[Solved] Are Swift dictionaries automatically sorted?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-are-swift-dictionaries-automatically-sorted\/\" aria-label=\"More on [Solved] Are Swift dictionaries automatically sorted?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[834,471,522],"class_list":["post-30336","post","type-post","status-publish","format-standard","hentry","category-solved","tag-dictionary","tag-ios","tag-swift"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Are Swift dictionaries automatically sorted? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-are-swift-dictionaries-automatically-sorted\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Are Swift dictionaries automatically sorted? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Swift&#8217;s Dictionary is a hash-based data structure. 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