swift - Swift-取字典元素的平均值

我看过StackOverflow，但是没有找到任何地方可以讨论在字典中取特定Int或Double的平均值。这是我创建的自定义词典：

var allInformationByDate = [
"1989-06-20": DayData(sales: 0, doorsKnocked: 0, milesWalked: 0.00, hoursWorked: 0.00),
"2016-06-22": DayData(sales: 2, doorsKnocked: 30, milesWalked: 2.00, hoursWorked: 3.00),
"2016-08-16": DayData(sales: 4, doorsKnocked: 30, milesWalked: 10.00, hoursWorked: 0.00)
]

所以我希望得到每一个的平均值。例如：

var avgSales = average(sales) = 2
var avgDoors = average(doorsKnocked) = 20
var avgMiles = average(milesWalked) = 4.0
var avgHours = average(hoursWorked) = 1.0

有人知道语法吗？谢谢你的帮忙！

最佳答案

var allInformationByDate = [
    "1989-06-20": DayData(sales: 0, doorsKnocked: 0, milesWalked: 0.00, hoursWorked: 0.00),
    "2016-06-22": DayData(sales: 2, doorsKnocked: 30, milesWalked: 2.00, hoursWorked: 3.00),
    "2016-08-16": DayData(sales: 4, doorsKnocked: 30, milesWalked: 10.00, hoursWorked: 0.00)
]


override func viewDidLoad() {
    super.viewDidLoad()

    var avgSales:Double! = 0.0
    var avgDoorsKnocked:Double! = 0.0
    var avgMilesWalked:Double! = 0.0
    var avgHoursWorked:Double! = 0.0

    let totalDays = Double(allInformationByDate.count)

    for (date, dayData) in allInformationByDate {
        print("date: \(date)")

        avgSales        = avgSales + Double(dayData.sales)
        avgDoorsKnocked = avgDoorsKnocked + Double(dayData.doorsKnocked)
        avgMilesWalked  = avgMilesWalked + dayData.milesWalked
        avgHoursWorked  = avgHoursWorked + dayData.hoursWorked

    }

    avgSales        = avgSales/totalDays
    avgDoorsKnocked = avgDoorsKnocked/totalDays
    avgMilesWalked  = avgMilesWalked/totalDays
    avgHoursWorked  = avgHoursWorked/totalDays

    print("\(avgSales),\(avgDoorsKnocked),\(avgMilesWalked), \(avgHoursWorked)")
}

关于swift - Swift-取字典元素的平均值，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/39652357/