table of Contents
description
The delete function is a built-in function of Go, which deletes elements from the map according to the specified key. If the key to be deleted is nil or there is no such element, delete does not operate.
Syntax and parameters
Function signature
func delete(m map[Type]Type1, key Type)| parameter name | meaning |
| m | Map to operate |
| key | Key to be removed from m |
Return value : The delete function does not have any return value.
Usage example
Use the delete function to delete the key-value pairs in the map:
package main
import "fmt"
func main() {
demo := make(map[string]interface{})
demo["code"] = "Golang"
demo["author"] = "Robert Griesemer"
delete(demo, "author")
fmt.Println(demo)
// outputs: map[code:Golang]
}
Precautions
Delete non-existent key
When deleting a key that does not exist, delete does not perform any operation.
package main
import "fmt"
func main() {
demo := make(map[string]interface{})
delete(demo, "author")
fmt.Println(demo)
// outputs: map[]
}
The deleted key is nil
When the deleted key is nil, delete does not operate.
package main
import "fmt"
func main() {
demo := make(map[interface{}]interface{})
demo["platform"] = "CentOS"
delete(demo, nil)
fmt.Println(demo)
// outputs: map[platform:CentOS]
}