Deleting Keys From Maps

We can also remove key-value pairs from maps using the delete() function.


delete(mapName, keyName)

Here are some points to note regarding the delete() function:

The delete function does not return any value;
If the key keyName doesn't exist, it simply does nothing;
If the map mapName doesn't exist, it shows an error during compilation.

Here is an example of the delete() function being used in a program:

index.go

package main

import "fmt"

func main() {

var numbers = map[string]int {

"one": 1,

"two": 2,

"three": 3,

}

fmt.Println(numbers) // Output: map[one:1 three:3 two:2]

delete(numbers, "three")

fmt.Println(numbers) // Output: map[one:1 two:2]

}


              12345678910111213
            
package main
import "fmt"

func main() {  
    var numbers = map[string]int {
        "one": 1,
        "two": 2,
        "three": 3,
    }
    fmt.Println(numbers) // Output: map[one:1 three:3 two:2]
    delete(numbers, "three")
    fmt.Println(numbers) // Output: map[one:1 two:2]
}

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Seção 6. Capítulo 7

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