{"id":2328,"date":"2020-06-20T22:32:35","date_gmt":"2020-06-20T17:02:35","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=2328"},"modified":"2020-06-20T22:33:37","modified_gmt":"2020-06-20T17:03:37","slug":"update-key-map-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/update-key-map-golang\/","title":{"rendered":"Update a key in the map in Go (Golang)"},"content":{"rendered":"\n<p class=\"has-medium-font-size\">When trying to add a key to the map which already exists, the new value will override the old value. This is analogous to updating a key in the map. <\/p>\n\n\n\n<p class=\"has-medium-font-size\">Let&#8217;s see an example<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\nfunc main() {\n    \/\/Declare\n    employeeSalary := make(map[string]int)\n\n    \/\/Adding a key value\n    fmt.Println(\"Before update\")\n    employeeSalary[\"Tom\"] = 2000\n    fmt.Println(employeeSalary)\n\n    fmt.Println(\"After update\")\n    employeeSalary[\"Tom\"] = 3000\n    fmt.Println(employeeSalary)\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\">Before update\nmap[Tom:2000]\nAfter update\nmap[Tom:3000]<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">In the above program after writing the same key <strong>&#8220;Tom&#8221; <\/strong>with a new value of <strong>3000 <\/strong>it overwrites the existing value of <strong>2000. <\/strong>When we print the map again the value printed is 3000<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When trying to add a key to the map which already exists, the new value will override the old value. This is analogous to updating a key in the map. Let&#8217;s see&#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-2328","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>Update a key in the 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\/update-key-map-golang\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Update a key in the map in Go (Golang) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"When trying to add a key to the map which already exists, the new value will override the old value. This is analogous to updating a key in the map. 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