Swift 4:如何为不同类型的json数组实现可编码协议

struct Person: Codable {
    let name: String
    let age: Int
}

struct Animal: Codable {
    let species: String
    let legs: Int
}

let json = """
{
    "people": [
        {
            "name": "John",
            "age": 25
        },
        {
            "name": "Jane",
            "age": 30
        }
    ],
    "animals": [
        {
            "species": "Dog",
            "legs": 4
        },
        {
            "species": "Cat",
            "legs": 4
        }
    ]
}
""".data(using: .utf8)!

struct DataContainer: Codable {
    let people: [Person]
    let animals: [Animal]
}

do {
    let decoder = JSONDecoder()
    let dataContainer = try decoder.decode(DataContainer.self, from: json)
    
    for person in dataContainer.people {
        print("Name: \(person.name), Age: \(person.age)")
    }
    
    for animal in dataContainer.animals {
        print("Species: \(animal.species), Legs: \(animal.legs)")
    }
} catch {
    print("Error decoding JSON: \(error)")
}