Question

How to combine 2 maps into a third map in Go

Answer 1

package main

import (
    "fmt"
)

func main() {
    map1 := map[string]string{
        "A": "aaa",
        "B": "bbb",
    }

    map2 := map[string]string{
        "C": "ccc",
        "B": "XYZ", // Overwrites key "B"
        "D": "ddd",
    }

    combined := make(map[string]string)

    // Copy map1 into combined
    for k, v := range map1 {
        combined[k] = v
    }

    // Merge map2 into combined (overwrites duplicates)
    for k, v := range map2 {
        combined[k] = v
    }

    // Display the result
    for k, v := range combined {
        fmt.Printf("%s => %s\n", k, v)
    }
}



/*
run:

D => ddd
C => ccc
A => aaa
B => XYZ

*/

 

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