{"id":16713,"date":"2022-10-21T23:25:01","date_gmt":"2022-10-21T17:55:01","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-print-the-key-value-types-of-a-golang-map\/"},"modified":"2022-10-21T23:25:01","modified_gmt":"2022-10-21T17:55:01","slug":"solved-print-the-key-value-types-of-a-golang-map","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-print-the-key-value-types-of-a-golang-map\/","title":{"rendered":"[Solved] Print the key\/value types of a Golang map"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-60244139\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"60244139\" data-parentid=\"60243799\" data-score=\"1\" data-position-on-page=\"2\" data-highest-scored=\"0\" data-question-has-accepted-highest-score=\"0\" itemprop=\"suggestedAnswer\" 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>Try not to use <code>reflect<\/code>.  But if you must use <code>reflect<\/code>:<\/p>\n<ul>\n<li>A <code>reflect.Value<\/code> value has a <code>Type()<\/code> function, which returns a <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/golang.org\/pkg\/reflect\/#Type\"><code>reflect.Type<\/code><\/a> value.<\/li>\n<li>If that type&#8217;s <code>Kind()<\/code> is <code>reflect.Map<\/code>, that <code>reflect.Value<\/code> is a value of type <code>map[T1]T2<\/code> for some types T1 and T2, where T1 is the key type and T2 is the element type.<\/li>\n<\/ul>\n<p>Therefore, when using <code>reflect<\/code>, we can pull apart the pieces like this:<\/p>\n<pre><code>func show(m reflect.Value) {\n    t := m.Type()\n    if t.Kind() != reflect.Map {\n        panic(\"not a map\")\n    }\n    kt := t.Key()\n    et := t.Elem()\n    fmt.Printf(\"m = map from %s to %s\\n\", kt, et)\n}\n<\/code><\/pre>\n<p><a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/play.golang.org\/p\/TYaz8-CjWAQ\">See a more complete example on the Go Playground<\/a>.  (Note that both maps are actually nil, so there are no keys and values to enumerate.)<\/p>\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 Print the key\/value types of a Golang map <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Try not to use reflect. But if you must use reflect: A reflect.Value value has a Type() function, which returns a reflect.Type value. If that type&#8217;s Kind() is reflect.Map, that reflect.Value is a value of type map[T1]T2 for some types T1 and T2, where T1 is the key type and T2 is the element &#8230; <a title=\"[Solved] Print the key\/value types of a Golang map\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-print-the-key-value-types-of-a-golang-map\/\" aria-label=\"More on [Solved] Print the key\/value types of a Golang map\">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":[596,4220,1408],"class_list":["post-16713","post","type-post","status-publish","format-standard","hentry","category-solved","tag-go","tag-reflect","tag-reflection"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Print the key\/value types of a Golang map - 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-print-the-key-value-types-of-a-golang-map\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Print the key\/value types of a Golang map - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Try not to use reflect. 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