{"id":8861,"date":"2021-05-29T12:32:06","date_gmt":"2021-05-29T12:32:06","guid":{"rendered":"https:\/\/prwatech.in\/blog\/?p=8861"},"modified":"2024-04-15T08:16:48","modified_gmt":"2024-04-15T08:16:48","slug":"golang-map","status":"publish","type":"post","link":"https:\/\/prwatech.in\/blog\/go-lang\/golang-map\/","title":{"rendered":"GoLang Map"},"content":{"rendered":"\r\n

Creating Maps in GoLang: Step-by-Step Tutorial<\/span><\/h2>\r\n

 <\/p>\r\n

A Map is a type of data structure<\/a>, it is a collection of unorder<\/a> pairs of key-value. With the help of map we can easily do retrieve, update and insert operations.<\/p>\r\n\r\n\r\n\r\n

Syntax:<\/strong><\/h4>\r\n\r\n\r\n\r\n

var\u00a0mymap\u00a0map[keytype]valuetype\u00a0<\/p>\r\n\r\n\r\n\r\n

Use Case 1:<\/strong><\/p>\r\n\r\n\r\n\r\n

package main<\/p>\r\n\r\n\r\n\r\n

import “fmt”<\/p>\r\n\r\n\r\n\r\n

func main() {<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 var mymap map[int]int<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if mymap == nil {<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“true”)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 } else {<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“False”)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/p>\r\n\r\n\r\n\r\n

}<\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

Output:<\/strong><\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

Use Case 2:<\/strong><\/p>\r\n\r\n\r\n\r\n

package main<\/p>\r\n\r\n\r\n\r\n

import “fmt”<\/p>\r\n\r\n\r\n\r\n

func main() {<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 var mymap map[int]int<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if mymap == nil {<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“true”)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 } else {<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“False”)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 map2 := map[int]string{<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 10: “Prwatech”,11: “Bangalore”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“Map 2 value”, map2)<\/p>\r\n\r\n\r\n\r\n

}<\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

Output:<\/strong><\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

Use Case 3: Create a map using make() function.<\/strong><\/p>\r\n\r\n\r\n\r\n

package main<\/p>\r\n\r\n\r\n\r\n

import “fmt”<\/p>\r\n\r\n\r\n\r\n

func main() {<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Creating a map<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Using make() function<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 var map1 = make(map[int]string)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(map1)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ As we already know that make() function<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/ always returns a map which is initialized<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ So, we can add values in it<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 map1[1] = “Prwatech”<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 map1[2] = “Bangalore”<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(map1)<\/p>\r\n\r\n\r\n\r\n

}<\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

Output:<\/strong><\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

Use Case 4: Adding new key elements and update operation:<\/strong><\/p>\r\n\r\n\r\n\r\n

package main<\/p>\r\n\r\n\r\n\r\n

import “fmt”<\/p>\r\n\r\n\r\n\r\n

\/\/ Main function<\/p>\r\n\r\n\r\n\r\n

func main() {<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Creating and initializing a map<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 m_a_p := map[int]string{<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 90: “Prwatech”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 91: “Bangalore”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 92: “Big Data”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“Original map: “, m_a_p)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Adding new key-value pairs in the map<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 m_a_p[93] = “Python”<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 m_a_p[94] = “Golang”<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“Map after adding new key-value pair:\\n”, m_a_p)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Updating values of the map<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 m_a_p[93] = “Gcp”<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“\\nMap after updating values of the map:\\n”, m_a_p)<\/p>\r\n\r\n\r\n\r\n

}<\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

Output:<\/strong><\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

Use Case 5:Retrieving values with the help of keys:<\/strong><\/p>\r\n\r\n\r\n\r\n

package main<\/p>\r\n\r\n\r\n\r\n

import “fmt”<\/p>\r\n\r\n\r\n\r\n

\/\/ Main function<\/p>\r\n\r\n\r\n\r\n

func main() {<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Creating and initializing a map<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 m_a_p := map[int]string{<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 90: “Red”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 91: “Yellow”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 92: “Orange”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 93: “Blue”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 94: “White”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“Original map: “, m_a_p)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Retrieving values with the help of keys<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 value_1 := m_a_p[90]<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 value_2 := m_a_p[93]<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“Value of key[90]: “, value_1)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“Value of key[93]: “, value_2)<\/p>\r\n\r\n\r\n\r\n

}<\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

Output:<\/strong><\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

Use Case 6:Deleting keys<\/strong><\/h4>\r\n\r\n\r\n\r\n

package main<\/p>\r\n\r\n\r\n\r\n

import “fmt”<\/p>\r\n\r\n\r\n\r\n

\/\/ Main function<\/p>\r\n\r\n\r\n\r\n

func main() {<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Creating and initializing a map<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 m_a_p := map[int]string{<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 90: “Red”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 91: “Yellow”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 92: “Orange”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 93: “Blue”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 94: “White”,<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“Original map: “, m_a_p)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Deleting keys<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Using delete function<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delete(m_a_p, 90)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delete(m_a_p, 93)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fmt.Println(“Map after deletion: “, m_a_p)<\/p>\r\n\r\n\r\n\r\n

}<\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

Output:<\/strong><\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n\r\n\r\n\r\n

 <\/p>\r\n","protected":false},"excerpt":{"rendered":"

Creating Maps in GoLang: Step-by-Step Tutorial   A Map is a type of data structure, it is a collection of unorder pairs of key-value. With the help of map we can easily do retrieve, update and insert operations. 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