如何使用数组创建可选结构

Question

我想创建以下结构/数组组合； 但是，我迷失在数组嵌套中。 这是设置“城市”的正确方法吗？如果是，那么修改它的最佳实践方法是什么，以便我可以创建具有不同客户价值的新城市？

谢谢！

struct City {
    var name: String
    var groceryStores: [GroceryStore]
}

struct GroceryStore {
    var name: String
    var employeesAtInterval = [employeeIDs]
}

var employeeIDs = [40, 20, 13, 44]

Answer 1

根据您的代码，这似乎是您想要实现的目标：

struct City {
  var name: String
  var groceryStores: [GroceryStore]
}

struct GroceryStore {
  var name: String
  // As employeeIDs are Ints, you should initialize it using this syntax
  var employeesAtInterval = [Int]()
}

let employeeIDs1 = [40, 20, 13, 44]
let employeeIDs2 = [40, 20, 13, 44]
...
let groceryStore1 = GroceryStore(
  name: "store 1",
   employeesAtInterval: employeeIDs1
)
let groceryStore2 = GroceryStore(
  name: "store 2",
  employeesAtInterval: employeeIDs2
)
...
let city1 = City(name: "city 1", groceryStores: [groceryStore1, groceryStore2])
let city2 = City(name: "city 2", groceryStores: [groceryStore3, groceryStore4])
let cities = [city1, city2]