{"id":4161,"date":"2020-09-30T23:15:41","date_gmt":"2020-09-30T17:45:41","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=4161"},"modified":"2020-09-30T23:15:52","modified_gmt":"2020-09-30T17:45:52","slug":"const-struct-go","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/const-struct-go\/","title":{"rendered":"Const struct 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\/const-struct-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\/const-struct-go\/#Example\" title=\"Example\">Example<\/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\">Go only supports four types of constant<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Numeric ( int, int64, float, float64, complex128 etc)<\/li><li>String<\/li><li>Character or rune<\/li><li>Boolean<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">It doesn&#8217;t support const struct. So below program would raise a compilation error<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Example\"><\/span><strong>Example<\/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\nimport \"fmt\"\ntype employee struct {\n    name string\n    age  int\n}\nfunc main() {\n    const e = employee{\n        name: \"John\",\n        age:  21,\n    }\n    fmt.Println(e)\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\">const initializer employee literal is not a constant<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">However workaround is to have a function which could return a struct. In a way that fulfills the purpose of a constant struct as it would return the same struct everytime<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\nimport \"fmt\"\ntype employee struct {\n    name string\n    age  int\n}\nfunc main() {\n    e := baseEmployee()\n    fmt.Println(e)\n}\nfunc baseEmployee() employee {\n    return employee{\n        name: \"Unnamed\",\n        age:  0,\n    }\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\">{Unnamed 0}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewExample Overview Go only supports four types of constant Numeric ( int, int64, float, float64, complex128 etc) String Character or rune Boolean It doesn&#8217;t support const struct. So below&#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-4161","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>Const struct 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\/const-struct-go\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Const struct in Go (Golang) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"Table of Contents OverviewExample Overview Go only supports four types of constant Numeric ( int, int64, float, float64, complex128 etc) String Character or rune Boolean It doesn&#8217;t support const struct. 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