social.go

package main

import (
	"fmt"
	"sort"
)

type StarredRepository struct {
	Repository string
	Users      []string
}

type ByPopularity []StarredRepository

func (c ByPopularity) Len() int {
	return len(c)
}

func (c ByPopularity) Swap(i, j int) {
	c[i], c[j] = c[j], c[i]
}

func (c ByPopularity) Less(i, j int) bool {
	return len(c[i].Users) > len(c[j].Users)
}

func main() {
	rails := StarredRepository{
		Repository: "rails",
		Users:      []string{"damien", "arnaud", "noemie"},
	}

	jquery := StarredRepository{
		Repository: "jquery",
		Users:      []string{"arnaud", "noemie"},
	}

	golang := StarredRepository{
		Repository: "golang",
		Users:      []string{"damien"},
	}

	starredRepositories := []StarredRepository{jquery, rails, golang}

	fmt.Printf("%+v\n", starredRepositories)
	// [{Repository:jquery Users:[arnaud noemie]} {Repository:rails Users:[damien arnaud noemie]} {Repository:golang Users:[damien]}]

	sort.Sort(ByPopularity(starredRepositories))

	fmt.Printf("%+v\n", starredRepositories)
	// [{Repository:rails Users:[damien arnaud noemie]} {Repository:jquery Users:[arnaud noemie]} {Repository:golang Users:[damien]}]
}