Go code that ensures elements in a slice are unique

unique elements in a slice

package main

import "fmt"

func uniqueNonEmptyElementsOf(s []string) []string {
  unique := make(map[string]bool, len(s))
	us := make([]string, len(unique))
	for _, elem := range s {
		if len(elem) != 0 {
			if !unique[elem] {
				us = append(us, elem)
				unique[elem] = true
			}
		}
	}

	return us

}

func main() {
	names := []string{"John", "Peter", "Jim", "John", "Ken", "Pete", "Jimmy"}
	fmt.Println(uniqueNonEmptyElementsOf(names))
}