Codable/Decodable example for parsing JSON with optional parameters

Drink.swift

class Drink: Codable {
    var name: String
    var color: String?
    
    private enum CodingKeys: String, CodingKey {
        case name, color
    }
    
    required init(from decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)
        name = try values.decode(String.self, forKey: .name)
        color = try? values.decode(String.self, forKey: .color)
    }
}

let json = """
{"name":"caipirinha", "color":"green"}
""".data(using: .utf8)!
let json2 = """
{"name":"gin tonica"}
""".data(using: .utf8)!