How to Swap Keys and Values in a Map in Go

We can swap keys and values in a map of integers in Go by iterating over the original map and inserting each key-value pair into a new map with the value as the key and the key as the value.

For example,

package main

import (
    "fmt"
)

func main() {
    // Declare and initialize a map of integers
    originalMap := map[int]int{
        1: 10,
        2: 20,
        3: 30,
        4: 40,
        5: 50,
    }

    // Declare an empty map to store the swapped key-value pairs
    swappedMap := make(map[int]int)

    // Iterate over the original map and insert each key-value pair into the new map with the value as the key and the key as the value
    for key, value := range originalMap {
        swappedMap[value] = key
    }

    // Print the resulting map
    fmt.Println("Swapped map of integers:")
    for key, value := range swappedMap {
        fmt.Printf("%d: %d\n", key, value)
    }
}

Swapped map of integers:
10: 1
20: 2
30: 3
40: 4
50: 5

We can swap keys and values in a map of strings in Go by iterating over the original map and inserting each key-value pair into a new map with the value as the key and the key as the value.

For example,

package main

import (
    "fmt"
)

func main() {
    // Declare and initialize a map of strings
    originalMap := map[string]string{
        "one": "uno",
        "two": "dos",
        "three": "tres",
        "four": "cuatro",
        "five": "cinco",
    }

    // Declare an empty map to store the swapped key-value pairs
    swappedMap := make(map[string]string)

    // Iterate over the original map and insert each key-value pair into the new map with the value as the key and the key as the value
    for key, value := range originalMap {
        swappedMap[value] = key
    }

    // Print the resulting map
    fmt.Println("Swapped map of strings:")
    for key, value := range swappedMap {
        fmt.Printf("%s: %s\n", key, value)
    }
}

Swapped map of strings:
uno: one
dos: two
tres: three
cuatro: four
cinco: five

We can swap keys and values in a map with mixed key and value types in Go by iterating over the original map and inserting each key-value pair into a new map with the value as the key and the key as the value. This example demonstrates swapping keys of type int with values of type string.

For example,

package main

import (
    "fmt"
)

func main() {
    // Declare and initialize a map with mixed types
    originalMap := map[int]string{
        1: "one",
        2: "two",
        3: "three",
        4: "four",
        5: "five",
    }

    // Declare an empty map to store the swapped key-value pairs
    swappedMap := make(map[string]int)

    // Iterate over the original map and insert each key-value pair into the new map with the value as the key and the key as the value
    for key, value := range originalMap {
        swappedMap[value] = key
    }

    // Print the resulting map
    fmt.Println("Swapped map of mixed types:")
    for key, value := range swappedMap {
        fmt.Printf("%s: %d\n", key, value)
    }
}

Swapped map of mixed types:
one: 1
two: 2
three: 3
four: 4
five: 5