Most efficent way I could find to iterate through a map in GO

map.go

package main

import (
	"bytes"
	"fmt"
)

func main() {

	testMap := map[string]string {"Hello":"World", "World":"Hello"}

	var buffer bytes.Buffer

	for i:= range testMap {

		buffer.WriteString(fmt.Sprintf("Key %v has value %v \n", i, testMap[i]))
	}

	fmt.Print(buffer.String())
}