计算字符串数组中的价格 Array<String>

Question

我有一个描述汽车零件列表的数组（Swift/IOS，数组已经在这样的结构中，来自其他来源。）：

let parts = [
    "Wheel = 230$",
    "Door = 200$",
    "Wheel = 300$",
    "Seat = 150$",
    "Seat = 150$",
    "Rugs = 100$"]

我需要计算每种零件的汽车零件价格总和。这是我正在寻找的结果：

let expectedResult = [
    "wheel 530$",
    "Door 200$",
    "Seat 300$",
    "Rugs 100$"
]

我不明白怎么做。

Answer 1

这是一个解决方案，我循环遍历数组并将每个元素拆分为“=”，然后使用字典将这些值相加。完成后，字典将转换回数组

let parts = [
    "Wheel = 230$",
    "Door = 200$",
    "Wheel = 300$",
    "Seat = 150$",
    "Seat = 150$",
    "Rugs = 100$"]

var values = [String: Int]() // Used to calculate totals per part

parts.forEach { string in
    let split = string.split(separator: "=")

    // Make sure the split worked as expected and that we have an integer value after the =
    guard split.count == 2,
          let value = Int(String(split[1]).trimmingCharacters(in: .whitespaces).dropLast()) else { return }

    let key = String(split[0]).trimmingCharacters(in: .whitespaces)

    // Sum values over the part name
    values[key, default: 0] += value
}

// Convert back to an array of strings
let output = values.map { "\([=10=].key) \([=10=].value)$"}

print(output)

计算字符串数组中的价格 Array<String>

Calculate of prices in within an array of strings Array<String>

arrays

string-parsing

swift