sort-struct.go

package main

import (
	"fmt"
	"math/rand"
	"sort"
)

// slice内に指定の値があるかをチェックして
// 要素番号を返す関数
func index(slice []string, item string) int {
	for i := range slice {
		if slice[i] == item {
			return i
		}
	}
	return -1
}

// 配列をシャッフルする
func shuffle(data []day) {
	n := len(data)
	for i := n - 1; i >= 0; i-- {
		j := rand.Intn(i + 1)
		data[i], data[j] = data[j], data[i]
	}
}

type day struct {
	name string
}

func main() {

	dayNameList := []day{
		day{"Sunday"},
		day{"Monday"},
		day{"Tuesday"},
		day{"Wednesday"},
		day{"Thursday"},
		day{"Friday"},
		day{"Saturday"},
	}

	// 曜日の並び順
	orderList := []string{
		"Sunday",
		"Monday",
		"Tuesday",
		"Wednesday",
		"Thursday",
		"Friday",
		"Saturday",
	}

	// まずは普通に表示
	shuffle(dayNameList)
	fmt.Println("Shuffle: \n", dayNameList)

	// 並び替え
	sort.Slice(dayNameList, func(i, j int) bool {
		return index(orderList, dayNameList[i].name) < index(orderList, dayNameList[j].name)
	})

	// 再度表示
	fmt.Println("After Sort: \n", dayNameList)
}

https://blog.framinal.life/entry/2021/06/29/213901