sorting_structs.go

package main

import (
	"fmt"
	"sort"
)

type AgeFactor []Person

func (a AgeFactor) Len() int           { return len(a) }
func (a AgeFactor) Less(i, j int) bool { return a[j].age < a[i].age }
func (a AgeFactor) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }

type Person struct {
	age       int
	firstName string
	lastName  string
}

func main() {
	people := []Person{Person{age: 10, firstName: "Reuben", lastName: "Cohen"}, Person{firstName: "Aaron", lastName: "Cohen", age: 50}, Person{firstName: "Courtney", lastName: "Cohen", age: 46}}
	sort.Sort(AgeFactor(people))
	for _, p := range people {
		fmt.Printf("%s %s is %d years old\n", p.firstName, p.lastName, p.age)
	}

}