Sort map by value

package main

import (
	"fmt"
	"sort"
)

func main() {
	scores := map[string]int{"Alma": 23, "Cecilia": 12, "David": 37, "Berta": 78}
	fmt.Println(len(scores))
	fmt.Println(scores)
	fmt.Println()

	for name, score := range scores {
		fmt.Printf("%-7v %v\n", name, score)
	}
	fmt.Println()

	names := make([]string, 0, len(scores))
	for name := range scores {
		names = append(names, name)
	}
	fmt.Println(names)
	fmt.Println()

	sort.Slice(names, func(i, j int) bool {
		return scores[names[i]] > scores[names[j]]
	})
	fmt.Println(names)
	fmt.Println()

	for _, name := range names {
		fmt.Printf("%-7v %v\n", name, scores[name])
	}
}

4
map[Alma:23 Berta:78 Cecilia:12 David:37]

Berta   78
Alma    23
Cecilia 12
David   37

[Alma Cecilia David Berta]

[Berta David Alma Cecilia]

Berta   78
David   37
Alma    23
Cecilia 12