{"id":11622,"date":"2022-09-28T02:09:42","date_gmt":"2022-09-27T20:39:42","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-can-i-check-array-count-changes-in-swift-closed\/"},"modified":"2022-09-28T02:09:42","modified_gmt":"2022-09-27T20:39:42","slug":"solved-how-can-i-check-array-count-changes-in-swift-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-can-i-check-array-count-changes-in-swift-closed\/","title":{"rendered":"[Solved] How can I check array count changes in Swift [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-59841279\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"59841279\" data-parentid=\"59841080\" data-score=\"2\" 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<blockquote>\n<p>Property observers observe and respond to changes in a property\u2019s<br \/>\n  value. Property observers are called every time a property\u2019s value is<br \/>\n  set, even if the new value is the same as the property\u2019s current<br \/>\n  value.<\/p>\n<p>You have the option to define either or both of these observers on a<br \/>\n  property:<\/p>\n<ul>\n<li>willSet is called just before the value is stored.<\/li>\n<li>didSet is called immediately after the new value is stored. <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.swift.org\/swift-book\/LanguageGuide\/Properties.html\">source<\/a><\/li>\n<\/ul>\n<\/blockquote>\n<pre><code>var arr = [1,2] {\n    willSet {\n        let newCount = newValue.count\n        callMe(count: newCount)\n    }\n    didSet {\n        let newCount = arr.count\n        callMe(count: newCount)\n    }\n}\n\nfunc callMe(count: Int) {\n    print(count)\n}\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How can I check array count changes in Swift [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Property observers observe and respond to changes in a property\u2019s value. Property observers are called every time a property\u2019s value is set, even if the new value is the same as the property\u2019s current value. You have the option to define either or both of these observers on a property: willSet is called just &#8230; <a title=\"[Solved] How can I check array count changes in Swift [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-can-i-check-array-count-changes-in-swift-closed\/\" aria-label=\"More on [Solved] How can I check array count changes in Swift [closed]\">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":[361,522],"class_list":["post-11622","post","type-post","status-publish","format-standard","hentry","category-solved","tag-arrays","tag-swift"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How can I check array count changes in Swift [closed] - 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-how-can-i-check-array-count-changes-in-swift-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How can I check array count changes in Swift [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Property observers observe and respond to changes in a property\u2019s value. Property observers are called every time a property\u2019s value is set, even if the new value is the same as the property\u2019s current value. You have the option to define either or both of these observers on a property: willSet is called just ... 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