[Go] mapのソート

配列のソートは強力だけど、
mapのソートは、JavaのTreeSetみたいには行かないようだね。

	package main
	import (
	"fmt"
	"sort"
	)
	type Shop struct {
	Code string
	}
	type Shops []*Shop
	func (d Shops) Len() int {
	return len(d)
	}
	func (d Shops) Swap(i, j int) {
	d[i], d[j] = d[j], d[i]
	}
	func (d Shops) Less(i, j int) bool {
	return d[i].Code < d[j].Code
	}
	func main() {
	shopMap := make(map[string]*Shop)
	shopMap["xx"] = &Shop{Code: "xx"}
	shopMap["hoge"] = &Shop{Code: "hoge"}
	shopMap["fuga"] = &Shop{Code: "fuga"}
	var keys Shops
	for _, s := range shopMap {
	keys = append(keys, s)
	}
	sort.Sort(keys)
	fmt.Printf("%t", keys)
	}

view raw sortmap.go hosted with ❤ by GitHub