1.2 KiB
Codable
Codable is any type that's both Encodable and Decodable. Encodable types can be serialized to a format, and Decodable types can be deserialized from a format.
If you only want your type to be serializable to another type, then you conform to Encodable. This will allow serializing this type to other formats such as JSON, XML, MySQL rows, MongoDB/BSON and more. But not backwards.
If you want to be able to construct your type from the raw data, you can conform your type to Decodable. This will allow converting serialized data to your model (the reverse of Encodable), allowing JSON, XML, MySQL and MongoDB data to construct your model. This will not allow serialization.
If you want both serialization and deserialization, you can conform to Codable.
For the best experience you should conform one of the above protocols in the definition of your struct or class. This way the compiler can infer the protocol requirements automatically. Conforming to these protocols in an extension will require you to manually implement the protocol requirements.
struct User: Codable {
var username: String
var age: Int
}
With this addition, the above struct can now be (de-)serialized between JSON, XML, MongoDB BSON, MySQL and more!