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.
1 | delete(mapName,keyName) |
Code example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | package mainimport ( "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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | package mainimport ( "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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