{"id":9859,"date":"2022-08-26T09:21:50","date_gmt":"2022-08-26T09:21:50","guid":{"rendered":"https:\/\/prwatech.in\/blog\/?p=9859"},"modified":"2024-04-15T10:07:02","modified_gmt":"2024-04-15T10:07:02","slug":"maps-in-golang","status":"publish","type":"post","link":"https:\/\/prwatech.in\/blog\/go-lang\/maps-in-golang\/","title":{"rendered":"Maps in Golang"},"content":{"rendered":"

How to make and use maps in Golang<\/span><\/h2>\n

Maps in Go (or Golang) are a fundamental data structure used for storing key-value pairs. A map allows efficient lookup, insertion, deletion, and update operations based on keys. In Go, a map is declared using the map<\/code> keyword followed by the key and value types enclosed in square brackets (map[keyType]valueType<\/code>).<\/p>\n

Maps in Go are unorder collections, meaning that the iteration order of elements is not guarante. The keys within a map must be unique, and each key can map to exactly one value.<\/p>\n

To interact with maps in Go, you can use built-in functions like make<\/code> to create a new map instance, len<\/code> to get the number of key-value pairs, and the delete<\/code> function to remove a key-value pair from the map. Accessing a value associated with a key can be done using square brackets (map[key]<\/code> syntax), which returns the value if the key exists or a zero-value if the key is not present.<\/p>\n

Go maps are widely use in various applications for efficient data retrieval and management, such as caching, data indexing, and maintaining associative relationships between entities. Understanding how to create, manipulate, and utilize maps is essential for effective Go programming and building scalable applications.<\/p>\n

Using Simple example we will<\/a> learn<\/a> mapping in Go lang :<\/strong><\/h4>\n

 <\/p>\n

    \n
  1. Go program to illustrate how to create maps\n
    package main\r\nimport \"fmt\"\r\n\r\nfunc main() {\r\nvar map_1 map[int]int   \/\/ Creating and initializing empty map\r\n\r\nif map_1 == nil      \/\/ Checking if the map is nil or not\r\n\r\n        fmt.Println(\"True\")\r\n    } else {\r\n        fmt.Println(\"False\")\r\n    }\r\n\r\n  \t\/\/ Creating and initializing a map\r\n    map_2: = map[int]string {\r\n        90: \"Math\",\r\n        91: \"Statistic\",\r\n        92: \"Python\",\r\n        93: \"SQL\",\r\n        94: \"Machine Learning \",\r\n    }\r\n    fmt.Println(\"Map-2: \", map_2)\r\n}\r\n<\/pre>\n
    Output :<\/p>\n
    PS C:\\GO_Language\\Maps> go run maps.go\r\nTrue\r\nMap-2:  map[90:Math 91:Statistic 92:Python 93:SQL 94:Tablue]\r\n<\/pre>\n<\/li>\n
  2. Go program to illustrate, iterate a map using the range for loop. The value of this loop may vary because the map is an unordered collection\n
    package main\r\nimport \"fmt\"\r\nfunc main() {\r\n    M_a_p: = map[int]string {\r\n        90: \"Math\",\r\n        91: \"Statistic\",\r\n        92: \"Python\",\r\n        93: \"SQL\",\r\n        94: \" Machine Learning \",\r\n    }\r\n    for id, pet := range m_a_p {\r\n        fmt.Println(id, pet)\r\n    }\r\n}\r\n<\/pre>\n
    Output :<\/p>\n
    PS C:\\GO_Language\\Maps> go run maps1.go\r\n92 Python\r\n93 SQL\r\n94  Machine Learning \r\n90 Math\r\n91 Statistic\r\n<\/pre>\n
    \u00a0<\/strong>\u00a0 \u00a0<\/strong><\/h3>\n
    <\/h3>\n
    \u00a0 \u00a0Using the Mark Function:<\/strong><\/h3>\n
      \n
    1. Go program to illustrate the difference between declaring an empty map using with the make()function and without it\n
      package main\r\n\r\nimport \"fmt\"\r\n\r\nfunc main() {\r\n    var My_course = make(map[float64]string)\r\n    fmt.Println(My_map)\r\n\r\n    My_course[1.3] = \"Data Scientist\"\r\n    My_course[1.5] = \"Data Analyst\"\r\n    fmt.Println(My_course)\r\n}\r\n<\/pre>\n
      Output :<\/p>\n
      PS C:\\GO_Language\\Maps> go run maps2.go\r\nmap[]\r\nmap[1.3:Data Scientist 1.5:Data Analyst]\r\n<\/pre>\n<\/li>\n
    2. Go program to illustrate the difference between declaring an empty map using with the make()function and without it.\n
      package main\r\n\r\nimport \"fmt\"\r\n\r\n\/\/ Main function\r\nfunc main() {\r\n\r\n    \/\/ Creating and initializing a map\r\n    m_a_p := map[int]string{\r\n\r\n        90: \"Math\",\r\n        91: \"Statistic\",\r\n        92: \"Python\",\r\n        93: \"SQL\",\r\n        94: \"Tablue\",\r\n    }\r\n\r\n    \/\/ Iterating map using for rang loop\r\n    for id, pet := range m_a_p {\r\n\r\n        fmt.Println(id, pet)\r\n    }\r\n}\r\n<\/pre>\n
      Output :<\/p>\n
      PS C:\\GO_Language\\Maps> go run maps3.go\r\n90 Math\r\n91 Statistic\r\n92 Python\r\n93 SQL\r\n94 Tablue\r\n<\/pre>\n
       <\/li>\n<\/ol>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
      How to make and use maps in Golang Maps in Go (or Golang) are a fundamental data structure used for storing key-value pairs. A map allows efficient lookup, insertion, deletion, and update operations based on keys. In Go, a map is declared using the map keyword followed by the key and value types enclosed in […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[666,1707],"tags":[2030,2031,1578,1580,1579],"class_list":["post-9859","post","type-post","status-publish","format-standard","hentry","category-go-lang","category-golang-modules","tag-creating-maps-in-golang-step-by-step-tutorial","tag-go-maps-in-action","tag-map-in-go-language","tag-mark-function","tag-simple"],"acf":[],"yoast_head":"\nHow to Make and Use Maps in Golang - Prwatech<\/title>\n<meta name=\"description\" content=\"Master How to Make and Use Maps in Golang - Dive deep with our expert instructors and comprehensive curriculum.\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Make and Use Maps in Golang - 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