Swift -在多个键/值的数组中选择特定值

let keyValueArray = [("key1", 1), ("key2", 2), ("key3", 3)]

let selectedValues = keyValueArray.filter { $0.0 == "key2" }.map { $0.1 }

print(selectedValues) // 输出: [2]

let keyValueArray = [("key1", 1), ("key2", 2), ("key3", 3)]

let selectedValues = keyValueArray.reduce([]) { result, element in
    if element.0 == "key2" {
        return result + [element.1]
    } else {
        return result
    }
}

print(selectedValues) // 输出: [2]

let keyValueArray = [("key1", 1), ("key2", 2), ("key3", 3)]

var selectedValues: [Int] = []

for (key, value) in keyValueArray {
    if key == "key2" {
        selectedValues.append(value)
    }
}

print(selectedValues) // 输出: [2]