Swift-如何从数组中找到最大的值并确定它来自哪个数组 [英] Swift - How to find Largest value from an array and identify which array it came from

问题描述

    var amya = (1)
    var amyb = (2)
    var amyc = (3)
    var amyd = (3)
    var amye = (9)
    var amyf = (3)
    var amyg = (4)
    var amyh = (4)
    var amyi = (10)
    var amyj = (1)

////创建数组所有值

///Create array with all values

  let users1 = [amya,amyb,amyc,amyd,amye,amyf,amyg,amyh,amyi,amyj]

////最大数量

////Find the max number

 let maxnum = maxElement(users1)

////结果为10

////Result is 10

我的问题是如何在不执行大量if语句的情况下查找结果 10来自哪个变量。

My question is how to find which variable the result "10" came from without doing a massive amount of if statements.

我想要结果是 amyi

I want result to be "amyi"

推荐答案

实际上，我认为问题在于返回变量名而不是值。您可以通过Swift字典来实现。示例代码如下：

Actually I think the issue is for return the variable name instead of the value. You can achieve it by Swift dictionary. Sample code is like:

let users1 = [
"amya": 1,
"amyb": 2,
"amyc": 10
]
let max = users1.values.maxElement()

func allKeysForValue<K, V : Equatable>(dict: [K : V], val: V) -> [K] {
    return dict.filter{ $0.1 == val }.map{ $0.0 }
}

let keys = allKeysForValue(users1, val: max!)
print(keys)

结果是： [amyc]

它将找到结果最大值来自哪个变量，并将变量名称作为键返回。

It will find which variable the result largest value came from and return the variable names as keys.

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