Golang程序中的随机函数和持久化

Question

我的程序如下：

我想做的是看看是否有办法创建一个随机函数或使用一个内置函数，该函数能够知道该程序中的哪些食物是从随机选择中选择的并拥有它又一周没用了？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，我希望该程序能够写下最后选择的项目，这样它至少在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",
    )
    recipe2.ID = 2
    recipe2.Yield = 4

    recipe3.name = "Simple Lemon Herb Chicken"
    recipe3.prepTime = 10
    recipe3.cookTime = 15
    recipe3.Ingredients = append(
        recipe3.Ingredients,
        "2 skinless boneless chicken breast halves,",
    )
    recipe3.Ingredients = append(
        recipe3.Ingredients,
        "1 Lemon,",
    )
    recipe3.Ingredients = append(
        recipe3.Ingredients,
        "Salt and Pepper to taste,",
    )
    recipe3.Ingredients = append(
        recipe3.Ingredients,
        "1 tablespoon olive oil,",
    )
    recipe3.Ingredients = append(
        recipe3.Ingredients,
        "2 sprigs fresh parsley (for garnish),",
    )
    recipe3.Ingredients = append(
        recipe3.Ingredients,
        "1 pinch dried oregano,",
    )
    recipe3.ID = 3
    recipe3.Yield = 2

    //call to printRecipe function below
    printRecipe(recipe1)
    totalTime(recipe1)
    printRecipe(recipe2)
    totalTime(recipe2)
    printRecipe(recipe3)
    totalTime(recipe3)

    //choose random number for recipe
    rand.Seed(time.Now().UTC().UnixNano())
    myrand := random(1, 6)
    fmt.Println(myrand)

    //logic for recipe to choose
    if myrand == 1 {
        fmt.Println(1)
        printRecipeOfTheDay(recipe1)
    } else if myrand == 2 {
        fmt.Println(2)
        printRecipeOfTheDay(recipe2)
    } else if myrand == 3 {
        fmt.Println(3)
        printRecipeOfTheDay(recipe3)
    } else if myrand == 4 {
        fmt.Println(4)
    }
}

//function to print Recipe
func printRecipe(recipe Recipe) {
    fmt.Printf("Recipe Name : %s\n", recipe.name)
    fmt.Printf("Prep Time : %d\n", recipe.prepTime)
    fmt.Printf("Cook Time : %d\n", recipe.cookTime)
    fmt.Printf("Ingredients : %s\n", recipe.Ingredients)
    fmt.Printf("Recipe ID : %d\n", recipe.ID)
}

//random number function
func random(min, max int) int {
    return rand.Intn(max-min) + min
}

//function to print the winner for recipe of the day to use
//for either lunch or dinner
func printRecipeOfTheDay(recipe Recipe) {
    fmt.Printf("The recipe of the day is : %s\n", recipe.name)
}

//Returns total time by addings cookTime and prepTime
func totalTime(recipe Recipe) {
    fmt.Printf("The total time for this recipe is %d\n", recipe.cookTime+recipe.prepTime)
}

Answer 1

正如@Volker 所说，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，如果你有 7 个食谱，你可以使用 time.Weekday 从切片中获取一个食谱编号，使用星期几作为切片的键。一旦你达到某个预定的日期，只需重新生成切片并保存。

package main

import "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)
}

Golang程序中的随机函数和持久化

Random function and persistence in Golang Program

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