How to Remove a Key-Value Pair from a Map in Go - Step by Step Examples

How to Remove a Key-Value Pair from a Map in Go ?

Answer

To remove a key-value pair from a map in Go, you can use the delete function. This function allows you to remove the key-value pair associated with the specified key.

✐ Examples

1 Removing a Key-Value Pair Using delete Function

We can remove a key-value pair from a map in Go using the delete function, which removes the key-value pair associated with the specified key.

For example,

We start by declaring and initializing a map named myMap with some key-value pairs. In this example, the map has string keys and integer values.
We use the delete function to remove the key-value pair associated with the key "two". The delete function removes the key-value pair from the map.
We print the contents of the map to the console using a range-based for loop and the fmt.Println function to verify that the key-value pair has been removed.

Go Program

package main

import "fmt"

func main() {
    // Declare and initialize a map
    myMap := map[string]int{
        "one": 1,
        "two": 2,
        "three": 3,
    }

    // Remove a key-value pair using delete function
    delete(myMap, "two")

    // Print the contents of the map
    for key, value := range myMap {
        fmt.Printf("%s: %d\n", key, value)
    }
}

Output

one: 1
three: 3

2 Handling Key Not Found Using delete Function

We can handle the case where a key is not found in a map in Go using the delete function, which does nothing if the key is not present.

For example,

We start by declaring and initializing a map named myMap with some key-value pairs. In this example, the map has string keys and integer values.
We use the delete function to attempt to remove the key-value pair associated with the key "four". The delete function does nothing if the key is not found.
We print the contents of the map to the console using a range-based for loop and the fmt.Println function to verify that the map is unchanged.

Go Program

package main

import "fmt"

func main() {
    // Declare and initialize a map
    myMap := map[string]int{
        "one": 1,
        "two": 2,
        "three": 3,
    }

    // Attempt to remove a non-existent key-value pair using delete function
    delete(myMap, "four")

    // Print the contents of the map
    for key, value := range myMap {
        fmt.Printf("%s: %d\n", key, value)
    }
}

Output

one: 1
two: 2
three: 3

3 Removing Multiple Key-Value Pairs Using delete Function

We can remove multiple key-value pairs from a map in Go using the delete function, which removes the key-value pairs associated with the specified keys.

For example,

We start by declaring and initializing a map named myMap with some key-value pairs. In this example, the map has string keys and integer values.
We use the delete function to remove the key-value pairs associated with the keys "one" and "three". The delete function removes the key-value pairs from the map.
We print the contents of the map to the console using a range-based for loop and the fmt.Println function to verify that the key-value pairs have been removed.

Go Program

package main

import "fmt"

func main() {
    // Declare and initialize a map
    myMap := map[string]int{
        "one": 1,
        "two": 2,
        "three": 3,
    }

    // Remove multiple key-value pairs using delete function
    delete(myMap, "one")
    delete(myMap, "three")

    // Print the contents of the map
    for key, value := range myMap {
        fmt.Printf("%s: %d\n", key, value)
    }
}

Output

two: 2

Summary

In this tutorial, we learned How to Remove a Key-Value Pair from a Map in Go language with well detailed examples.

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How to Remove a Key-Value Pair from a Map in Go - Step by Step Examples