To merge the maps in Golang, you can use the “for loop” to traverse over one map and append its key-value pairs to the second map.
package main
import (
"fmt"
)
func main() {
map1 := map[string]int{
"bdy_kl": 10,
"eno_kl": 21,
}
map2 := map[string]int{
"bdy_kb": 20,
"eno_kb": 19,
}
// Print the map before merging
fmt.Println("The First Map: ", map1)
fmt.Println("The Second Map: ", map2)
for x, y := range map1 {
map2[x] = y
}
fmt.Println("The merged Map is: ", map2)
}
Output
The First Map: map[bday_kl:10 eno_kl:21]
The Second Map: map[bday_kb:20 eno_kb:19]
The merged Map is: map[bday_kb:20 bday_kl:10 eno_kb:19 eno_kl:21]
In this example, we created two maps with four different key: value pairs.
Used the Prinln() function to print the maps.
Using for loop and range, we are traversing map1 and appending map1’s key: value pair to map2 and return the merged maps.
The approach will overwrite any key-value pairs in map2 that have the same keys as those in map1. If you want to preserve the values in map2, you can check for the presence of a key in the map before adding it.
To append a new key-value pair to a map, use the syntax map[key] = value.
You must be careful while using the approach because If a key already has a value, that value will be obliterated.
That’s it for this article.

Krunal Lathiya is a Software Engineer with over eight years of experience. He has developed a strong foundation in computer science principles and a passion for problem-solving. In addition, Krunal has excellent knowledge of Distributed and cloud computing and is an expert in Go Language.