ProgramGuruTo set a default value for a key in a map in Go, you can check if the key exists and if not, assign the default value using the subscript operator.
We can set a default value for a key in a map in Go by checking if the key exists and if not, assigning the default value using the subscript operator.
For example,
myMap with some key-value pairs. In this example, the map has string keys and integer values.fmt.Printf function.package main
import "fmt"
func main() {
// Declare and initialize a map
myMap := map[string]int{
"one": 1,
"two": 2,
"three": 3,
}
// Set a default value using an if statement
if _, exists := myMap["four"]; !exists {
myMap["four"] = 4
}
// Print the updated map
for key, value := range myMap {
fmt.Printf("%s: %d\n", key, value)
}
}one: 1 two: 2 three: 3 four: 4
We can set a default value for a key in a map in Go by using a helper function that checks if the key exists and if not, assigns the default value.
For example,
myMap with some key-value pairs. In this example, the map has string keys and integer values.setDefault that takes a map, a key, and a default value as arguments. The function checks if the key exists in the map and if not, assigns the default value using the subscript operator.setDefault function to set the default value for the key.fmt.Printf function.package main
import "fmt"
// Helper function to set a default value
func setDefault(m map[string]int, key string, defaultValue int) {
if _, exists := m[key]; !exists {
m[key] = defaultValue
}
}
func main() {
// Declare and initialize a map
myMap := map[string]int{
"one": 1,
"two": 2,
"three": 3,
}
// Set a default value using the helper function
setDefault(myMap, "four", 4)
// Print the updated map
for key, value := range myMap {
fmt.Printf("%s: %d\n", key, value)
}
}one: 1 two: 2 three: 3 four: 4
We can set multiple default values for keys in a map in Go by using a helper function that checks if the keys exist and if not, assigns the default values.
For example,
myMap with some key-value pairs. In this example, the map has string keys and integer values.setDefault that takes a map, a key, and a default value as arguments. The function checks if the key exists in the map and if not, assigns the default value using the subscript operator.setDefault function to set multiple default values for the keys.fmt.Printf function.package main
import "fmt"
// Helper function to set default values
func setDefault(m map[string]int, key string, defaultValue int) {
if _, exists := m[key]; !exists {
m[key] = defaultValue
}
}
func main() {
// Declare and initialize a map
myMap := map[string]int{
"one": 1,
"two": 2,
"three": 3,
}
// Set multiple default values using the helper function
setDefault(myMap, "four", 4)
setDefault(myMap, "five", 5)
// Print the updated map
for key, value := range myMap {
fmt.Printf("%s: %d\n", key, value)
}
}one: 1 two: 2 three: 3 four: 4 five: 5
In this tutorial, we learned How to Set a Default Value for a Key in a Map in Go language with well detailed examples.