如何在swift上打印字典中的字符串？

如何打印此词典中最大数字的类型

let interestingNumbers = [
    "Prime": [2, 3, 5, 7, 11, 13],
    "Fibonacci": [1, 1, 2, 3, 5, 8],
    "Square": [1, 4, 9, 16, 25],
]
var largest = 0
var typeoflargest:String = " "
for (kind, numbers) in interestingNumbers {
    for type in kind.characters {
        for number in numbers {
            if number > largest {
                largest = number
                typeoflargest = String(type)
            }
        }
    }
}
print(largest)
print(typeoflargest)

输出：

25
S

---

为什么我只得到第一个字符“S”而不是“Square”？

没有理由迭代

类型的
字符串的字符。只需执行以下操作：

let interestingNumbers = [
    "Prime": [2, 3, 5, 7, 11, 13],
    "Fibonacci": [1, 1, 2, 3, 5, 8],
    "Square": [1, 4, 9, 16, 25],
]
var largest = 0
var typeoflargest:String = ""
for (kind, numbers) in interestingNumbers {
    for number in numbers {
        if number > largest {
            largest = number
            typeoflargest = kind
        }
    }
}
print(largest)
print(typeoflargest)

输出：

25

方格

备选办法：

let interestingNumbers = [
    "Prime": [2, 3, 5, 7, 11, 13],
    "Fibonacci": [1, 1, 2, 3, 5, 8],
    "Square": [1, 4, 9, 16, 25],
]

let maximum = interestingNumbers
    .map{ type, numbers in return (type: type, number: numbers.max()!) }
    .max(by: { $0.number < $1.number })!

print(maximum.type, maximum.number)

然后，通过比较它们的数量，得到最大类型/数量对，得出结果：

(type: "Square", number: 25) // 25 is the max of 25, 13, 8

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(type: "Square", number: 25) // 25 is the max of 25, 13, 8