How to copy a map to another map in Golang?

Maps in Golang is a collection of unordered pairs of key-value. It is widely used because it provides fast lookups and values that can retrieve, update, or delete with the help of keys. In Map, you can copy a map to another map using the for loop provided by the Go language. In for loop, we fetch the index value 1 by 1 with the element and assign it to another map.

Syntax:

for key, value := range originalMap{
}

Let us discuss this concept with the help of the examples:

Example 1:

// Go program to illustrate how to
// copy a map to another map

package main

import "fmt"

func main() {

    // Creating and initializing a map
    // Using shorthand declaration and
    // using map literals
    originalMap := make(map[string]int)
    originalMap["one"] = 1
    originalMap["two"] = 2
    originalMap["three"] = 3
    originalMap["four"] = 4
    originalMap["five"] = 5
    originalMap["six"] = 6
    originalMap["seven"] = 7
    originalMap["eight"] = 8
    originalMap["nine"] = 9


    // Creating empty map
    CopiedMap:= make(map[string]int)

    /* Copy Content from Map1 to Map2*/
    for index, element  := range originalMap{
         CopiedMap[index] = element
    }

    for index, element  := range CopiedMap{
        fmt.Println(index, "=>", element)
    }
}

Output:

seven => 7
eight => 8
two => 2
four => 4
three => 3
six => 6
nine => 9
one => 1
five => 5

Example 2:

// Go program to illustrate how to
// copy a map to another map

package main

import "fmt"

func main() {

    // Creating and initializing a map
    // Using shorthand declaration and
    // using map literals
    map_1 := map[int]string{

            90: "Dog",
            91: "Cat",
            92: "Cow",
            93: "Bird",
            94: "Rabbit",
    }

    // Creating and initializing empty map
    map2 := map[string]int{}

    /* Copy Content from Map1 to Map2*/
    for key, value := range map_1{
         map2[value] = key
    }

    fmt.Println("Copied Map :", map2)
}

Output:

Copied Map : map[Bird:93 Rabbit:94 Dog:90 Cat:91 Cow:92]