Easy way to get the keys in a map in alphabetical order

Question

In Go, what\'s the easiest way to get the keys in a map sorted alphabetically? This is the shortest way I can do it:

package main

import \"container/vector\"
im         


        

Answer 1

You are sorting an array of strings using StringVector. To minimize overhead, you could sort an array of strings.

package main

import (
    "fmt"
    "sort"
)

func main() {
    m := map[string]string{"b": "15", "z": "123123", "x": "sdf", "a": "12"}
    mk := make([]string, len(m))
    i := 0
    for k, _ := range m {
        mk[i] = k
        i++
    }
    sort.Strings(mk)
    fmt.Println(mk)
}

Output:

[a b x z]

Answer 2

That would be most elegant method:

package main

import (
    "fmt"
    "sort"
)

func main() {
    m := map[string]string{"b": "15", "z": "123123", "x": "sdf", "a": "12"}
    keys := make([]string, 0, len(m))
    for key := range m {
        keys = append(keys, key)
    }
    sort.Strings(keys)
    fmt.Println(keys)
}