{"id":2331,"date":"2020-06-20T22:37:06","date_gmt":"2020-06-20T17:07:06","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=2331"},"modified":"2020-06-20T22:37:19","modified_gmt":"2020-06-20T17:07:19","slug":"allowed-key-and-value-types-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/allowed-key-and-value-types-golang\/","title":{"rendered":"Allowed key and value types for a map in Go (Golang)"},"content":{"rendered":"\n<p class=\"has-medium-font-size\">Maps are golang builtin datatype similar to the hash table which maps a key to a value. . Below is the format for a map:<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">map[key_type]value_type<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Both <strong>key_type<\/strong> and <strong>value_type<\/strong> can be of different type or same type. For below example the key type is <strong>string<\/strong> and value type is <strong>int<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">map[string]int<\/code><\/pre>\n\n\n\n<p class=\"has-large-font-size\"><strong>Allowed Key types in a Map<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size\">The map key can be any type that is comparable. Some of the comparable types as defined by go specification are<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>boolean<\/li><li>numeric<\/li><li>string,<\/li><li>pointer<\/li><li>channel<\/li><li>interface types<\/li><li>structs &#8211; if all it&#8217;s field type is comparable<\/li><li>array &#8211; if the type of value of array element is comparable<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">Some of the types which are not comparable as per go specification and which cannot be used as a key in a map are.<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Slice<\/li><li>Map<\/li><li>Function<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">Reference &#8211; <a href=\"https:\/\/golang.org\/ref\/spec#Comparison_operators\">https:\/\/golang.org\/ref\/spec#Comparison_operators<\/a><\/p>\n\n\n\n<p class=\"has-large-font-size\"><strong>Allowed Value types in a Map<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Value can be of any type in a map.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Maps are golang builtin datatype similar to the hash table which maps a key to a value. . Below is the format for a map: Both key_type and value_type can be of&#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-2331","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>Allowed key and value types for a map 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\/allowed-key-and-value-types-golang\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Allowed key and value types for a map in Go (Golang) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"Maps are golang builtin datatype similar to the hash table which maps a key to a value. . 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