swift - 如果一个键在数组中重复，我想添加该键的值

Question

如果一个键在数组中重复，我想合并该键的值。例如，我有以下数组。

var arrays = [
    ["Product":"Item0", "Price":"15"],
    ["Product":"Item1", "Price":"53"],
    ["Product":"Item2", "Price":"12"],
    ["Product":"Item1", "Price":"83"],
    ["Product":"Item0", "Price":"10"],
    ["Product":"Item3", "Price":"88"],
    ["Product":"Item0", "Price":"44"]
]

我想像这样改变这个数组。

[
    ["Product": "item0", "Price": "69"],
    ["Product": "item1", "Price": "136"],
    ["Product": "item2", "Price": "12"],
    ["Product": "item3", "Price": "88"]
]

我该怎么办？

这是我写的代码。但是，如果重复了两个以上的键，则不会显示确切的值。你能在这里稍微修一下还是给我一个新的方法？

var arrays= [
    ["Product":"Item0", "Price":"15"],
    ["Product":"Item1", "Price":"53"],
    ["Product":"Item2", "Price":"12"],
    ["Product":"Item1", "Price":"83"],
    ["Product":"Item0", "Price":"10"],
    ["Product":"Item3", "Price":"88"],
    ["Product":"Item0", "Price":"44"]
]

var filteredArrays = [[String:String]]()
var sum : Int = 0

for i in 0..<arrayOfDicts.count {

    let Product1 = arrayOfDicts[i]["Product"]

    if(i == 0){
        filteredArrays.append(arrayOfDicts[i])
    } else {

        var flag = false
        for j in 0..<filteredArrays.count {

            let Product2:String = filteredArrays[j]["Product"]!

            if Product1 == Product2 {

                sum += (Int(arrayOfDicts[i]["Price"]!)! + Int(arrayOfDicts[j]["Price"]!)!)

                filteredArrays[j] = ["Product":"\(arrayOfDicts[i]["Product"]!)", "Price":"\(sum)"]

                sum = 0
                flag = true
            }
        }

        if !flag {
            filteredArrays.append(arrayOfDicts[i])
        }
    }

}

谢谢

Answer 1

1. 遍历您的产品
2. 检查“Product”是否包含有效字符串
3. 将价格提取为 Int(如果需要，也可以是 float)。默认为零以避免错误的总和。
4. 创建一个以产品名称为键的字典，并用相同的键对值求和

5. 字典转数组

   var result = [String : Int]()
   
   for product in arrays {
   
       if let productKey = product["Product"] {
            let value = Int(product["Price"] ?? "0")
            if result[productKey] == nil, let value = value {
               result[productKey] = value
            } else if let value = value {
               result[productKey]! += value
            }
       }
   }
   
   let newArray = result.map {["Product":$0, "Price": $1]}