[Swift] Encodable instance to dictionary

Encodable+dictionary.swift

extension Encodable {
    
    subscript(key: String) -> Any? {
        return dictionary[key]
    }
    
    var dictionary: [String: Any] {
        let dict: [String: Any]? = try? JSONSerialization.jsonObject(with: JSONEncoder().encode(self)) as? [String: Any]
        return dict ?? [:]
    }
    
}

/*
struct Person: Codable {
    var name: String
    var age: Int
}

let person1 = Person(name: "Pio", age: 20)

let dict                = person1.dictionary    // ["name": "Pio", "age": 20]
let resultForName       = person1["name"]       // "Pio"
let resultForAge        = person1["age"]        // 20
let resultForInvalidKey = person1["pet"]        // nil
*/