struct Task: Codable {
    var name: String
    var number: Int
}

var task = Task(name: "A", number:1)
var task2 = Task(name: "B", number:2)

var tasks = [task, task2]

extension Array where Element: Codable 
{
    func toDictionary() throws -> [[String: Any]]? {
        print(self)
        let data = try JSONEncoder().encode(self)
        return try JSONSerialization.jsonObject(with: data, options: .allowFragments) as? [[String: Any]]
    }
}

extension Encodable 
{
    func toDictionary() throws -> [String: Any]? {
        let data = try JSONEncoder().encode(self)
        return try JSONSerialization.jsonObject(with: data, options: .allowFragments) as? [String: Any]
    }
}

print(try! tasks.toDictionary())
print(try! task.toDictionary())