After adding some key-value pairs, we may want to delete or remove a key from the map. Go language provides us with the built-in delete function which helps us to delete or remove a key from the map.
Syntax for the delete function
delete function accepts two parameters – one will be the map itself and the second will be the key that we want to delete from that map.
delete(mapName,keyName)
Code example
package main
import (
"fmt"
)
func main() {
theMap := make(map[string]int)
theMap["first"] = 10
theMap["second"] = 20
theMap["third"] = 30
theMap["fourth"] = 40
fmt.Println("Map contents before:", theMap)
// deleting key "third" from the map
delete(theMap, "third")
fmt.Println("Map contents after:", theMap)
}
Output –
Map contents before: map[first:10 fourth:40 second:20 third:30]
Map contents after: map[first:10 fourth:40 second:20]We have successfully deleted the “third” key from the map.
But what if we try to delete a key that does not exist on the map?
In this scenario, the delete() function won’t cause any panic without any changes to the map.
package main
import (
"fmt"
)
func main() {
theMap := make(map[string]int)
theMap["first"] = 10
theMap["second"] = 20
theMap["third"] = 30
theMap["fourth"] = 40
fmt.Println("Map contents before:", theMap)
// deleting key "codekru" from the map,
// that do not exist in the map
delete(theMap, "codekru")
fmt.Println("Map contents after:", theMap)
}
Output –
Map contents before: map[first:10 fourth:40 second:20 third:30]
Map contents after: map[first:10 fourth:40 second:20 third:30]Related Articles –
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