Sorting a list of structs/objects based on the object's properties.

sortBasedOnStructsProperty.go

package main

import (
  "fmt"
	"sort"
)

type Person struct {
	Name   string
	Weight int
	Iq int
}
type People []*Person


func (p People) Len() int      { return len(p) }
func (p People) Swap(i, j int) { p[i], p[j] = p[j], p[i] }

type ByName struct{ People }
func (p ByName) Less(i, j int) bool { return p.People[i].Name < p.People[j].Name }

type ByWeight struct{ People }
func (p ByWeight) Less(i, j int) bool { return p.People[i].Weight < p.People[j].Weight }

type ByIq struct {People}
func (p ByIq) Less(i, j int) bool { return p.People[i].Iq < p.People[j].Iq }

func main() {
	p := []*Person{
		{"Bob", 135, 104},
		{"Gary", 165, 108},
		{"Frank", 183,100},
		{"Troy", 320,108},
		{"Sam", 144,150},
		{"Sean", 144,88},
	}
	
	sort.Sort(ByIq{p})
	fmt.Println("People by Iq:")
	for _, person := range p {
		fmt.Printf("%-8s (Weight: %v) (IQ: %v) \n", person.Name, person.Weight, person.Iq)
	}

	sort.Sort(ByWeight{p})
	fmt.Println("People by weight:")
	for _, person := range p {
		fmt.Printf("%-8s (Weight: %v) (IQ: %v) \n", person.Name, person.Weight, person.Iq)
	}

	sort.Sort(ByName{p})
	fmt.Println("People by name:")
	for _, person := range p {
		fmt.Printf("%-8s (Weight: %v) (IQ: %v) \n", person.Name, person.Weight, person.Iq)
	}
	
}