Sorting and Inverting a Map

package main
import (
    "fmt"
    "sort"
)

var (
    barVal = map[string]int{"alpha": 34, "bravo": 56, "charlie": 23, "delta": 87,
    "echo": 56, "foxtrot": 12, "golf": 34, "hotel": 16, "indio": 87, "juliet": 65, "kilo":
    43, "lima": 98}
)

func main() {
    fmt.Println("unsorted:")
    for k, v := range barVal {
        fmt.Printf("key: %v, value: %v / ", k, v)   // read random keys
    }
    keys := make([]string, len(barVal))     // storing all keys in separate slice
    i := 0
    for k := range barVal {
        keys[i] = k
        i++
    }
    sort.Strings(keys)  // sorting the keys slice
    fmt.Println()
    fmt.Println("\nsorted:")
    for _, k := range keys {
        fmt.Printf("key: %v, value: %v / ", k, barVal[k])   // reading key from keys and value from barVal
    }
}