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Understanding Result Type in Swift 5 with Daniel Steinberg Understanding the Result Type in Swift Result Type in Swift

//class ManagedBuffer<Header, Element> enum MultiValue: Codable { struct Key: CodingKey, Hashable, CustomStringConvertible { var description: String { return stringValue }

    let stringValue: String
    init(_ string: String) { self.stringValue = string }
    init?(stringValue: String) { self.init(stringValue) }
    var intValue: Int? { return nil }
    init?(intValue: Int) { return nil }
}
case string(String)
case number(Double)
case object([Key: MultiValue])
case array([MultiValue])
case bool(Bool)
case null
init(from decoder: Decoder) throws {
    if let string = try? decoder.singleValueContainer().decode(String.self) { self = .string(string) }
    else if let number = try? decoder.singleValueContainer().decode(Double.self) { self = .number(number) }
    else if let object = try? decoder.container(keyedBy: Key.self) {
        var result: [Key: MultiValue] = [:]
        for key in object.allKeys {
            result[key] = (try? object.decode(MultiValue.self, forKey: key)) ?? .null
        }
        self = .object(result)
    }
    else if var array = try? decoder.unkeyedContainer() {
        var result: [MultiValue] = []
        for _ in 0..<(array.count ?? 0) {
            result.append(try array.decode(MultiValue.self))
        }
        self = .array(result)
    }
    else if let bool = try? decoder.singleValueContainer().decode(Bool.self) { self = .bool(bool) }
    else if let isNull = try? decoder.singleValueContainer().decodeNil(), isNull { self = .null }
    else { throw DecodingError.dataCorrupted(DecodingError.Context(codingPath: [], debugDescription: "Unknown MultiValue type")) }
}
func encode(to encoder: Encoder) throws {
    switch self {
    case .string(let string):
        var container = encoder.singleValueContainer()
        try container.encode(string)
    case .number(let number):
        var container = encoder.singleValueContainer()
        try container.encode(number)
    case .bool(let bool):
        var container = encoder.singleValueContainer()
        try container.encode(bool)
    case .object(let object):
        var container = encoder.container(keyedBy: Key.self)
        for (key, value) in object {
            try container.encode(value, forKey: key)
        }
    case .array(let array):
        var container = encoder.unkeyedContainer()
        for value in array {
            try container.encode(value)
        }
    case .null:
        var container = encoder.singleValueContainer()
        try container.encodeNil()
    }
    throw MultiValueError.missingValue
}
//    init(from decoder: Decoder) throws {
//        if let int = try? decoder.singleValueContainer().decode(Int.self) {
//            self = .int(int)
//            return
//        }
//        if let string = try? decoder.singleValueContainer().decode(String.self) {
//            self = .string(string)
//            return
//        }
//        throw MultiValueError.missingValue
//    }
enum MultiValueError:Error {
    case missingValue
}
//https://stackoverflow.com/questions/58175721/how-to-encode-struct-in-swift-using-encodable-that-contains-an-already-encoded-v

}