{"id":2624,"date":"2020-07-18T22:07:00","date_gmt":"2020-07-18T16:37:00","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=2624"},"modified":"2020-07-18T22:07:10","modified_gmt":"2020-07-18T16:37:10","slug":"non-struct-type-implementing-interface-go","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/non-struct-type-implementing-interface-go\/","title":{"rendered":"Non-struct Custom Type Implementing an interface in Go (Golang)"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/non-struct-type-implementing-interface-go\/#Overview\" title=\"Overview\">Overview<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/non-struct-type-implementing-interface-go\/#Code\" title=\"Code\">Code<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Overview\"><\/span><strong>Overview<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">It is also perfectly ok for any non-struct custom type to implement an interface. Let&#8217;s see an example<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Assume we have an interface <strong>animal<\/strong> as below<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">type animal interface {\n    breathe()\n    walk()\n}<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Code\"><\/span><strong>Code<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\ntype animal interface {\n\tbreathe()\n\twalk()\n}\n\ntype cat string\n\nfunc (c cat) breathe() {\n\tfmt.Println(\"Cat breathes\")\n}\n\nfunc (c cat) walk() {\n\tfmt.Println(\"Cat walk\")\n}\n\nfunc main() {\n\tvar a animal\n\n\ta = cat(\"smokey\")\n\ta.breathe()\n\ta.walk()\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Cat breathes\nCat walk<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">The above program illustrates the concept that any custom type can also implement an interface. The <strong>cat<\/strong> is of string type and it implements the <strong>breathe<\/strong> and <strong>walk<\/strong> method hence it is correct to assign an instance of <strong>cat<\/strong> type to a variable of <strong>animal<\/strong> type.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewCode Overview It is also perfectly ok for any non-struct custom type to implement an interface. Let&#8217;s see an example Assume we have an interface animal as below Code&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[3,4],"class_list":["post-2624","post","type-post","status-publish","format-standard","hentry","category-tech","tag-go","tag-golang"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Non-struct Custom Type Implementing an interface in Go (Golang) - Welcome To Golang By Example<\/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:\/\/golangbyexamples.com\/non-struct-type-implementing-interface-go\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Non-struct Custom Type Implementing an interface in Go (Golang) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"Table of Contents OverviewCode Overview It is also perfectly ok for any non-struct custom type to implement an interface. 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