Golang程序中的随机函数和持久化

Question

我想要做的是看看是否有一种方法可以创建一个随机函数或使用一个内置函数，该函数能够使用知道该程序中的哪些食物是从随机选择中选择的，并且不再用于另一个星期？我目前有 1-6 种食物，但我想确保一周内不会连续两次选择相同的食物，例如 2。此外，我希望程序能够写下最后选择的项目，这样它至少一周内不会再次选择它。我能用一个可以读取的简单文本文件来完成这个吗？

package main

import (

    "fmt"

    "math/rand"

    "time"

)

type Recipe struct { //Struct for recipe information

    name        string

    prepTime    int

    cookTime    int

    Ingredients []string //this is now a slice that will accept multiple elements

    ID          int

    Yield       int

}

func main() {

    var recipe1 Recipe //Declare recipe1 of Type Recipe

    var recipe2 Recipe

    var recipe3 Recipe

    /* recipe1 specifications */

    recipe1.name = "BBQ Pulled Chicken"

    recipe1.prepTime = 25

    recipe1.cookTime = 5

    recipe1.Ingredients = append(

        recipe1.Ingredients,

        "1 8-ounce can reduced-sodium tomato sauce",

    )

    recipe1.Ingredients = append(

        recipe1.Ingredients,

        "1/2 medium onion (grated),",

    )

    recipe1.ID = 1

    recipe1.Yield = 8

    /* Recipe 2 specifications */

    recipe2.name = "Steak Tacos with Pineapple"

    recipe2.prepTime = 45

    recipe2.cookTime = 45

    recipe2.Ingredients = append(

        recipe2.Ingredients,

        "3 tablespoons soy sauce,",

    )

    recipe2.Ingredients = append(

        recipe2.Ingredients,

        "1 tablespoon finely grated garlic,",

    )

    recipe2.Ingredients = append(

        recipe2.Ingredients,

        "1 tablespoon finely grated peeled fresh ginger,",

    )

    recipe2.Ingredients = append(

        recipe2.Ingredients,

        "1 1/2 pounds skirt steak, cut into 5-inch lengths,",

    )

    recipe2.Ingredients = append(

        recipe2.Ingredients,

        "Salt",

    )

    recipe2.Ingredients = append(

        recipe2.Ingredients,

        "Pepper",

    )

Answer 1

Perm 可能是您想要使用的。这是一个将为您生成伪随机列表的示例。您可以将其保存到 json 编码的文件中。然后，如果您有 7 个食谱，您可以使用 time.Weekday 从切片中获取食谱编号，使用星期几作为切片的关键。一旦您达到某个预定日期，只需重新生成切片并保存。package mainimport "fmt"import "math/rand"import "time"func main() {  r := rand.New(rand.NewSource(time.Now().UnixNano()))  i := r.Perm(6)  fmt.Printf("%v\n", i)}