Passing Decodable object as generic parameter

data+extension.swift

extension Decodable
{
    init(_ data: Data) throws {
        self = try JSONDecoder().decode(Self.self, from: data)
    }
}

extension Data
{
    func toObject<T>() throws -> T?
    {
        let decode = T.self as? Decodable.Type
        assert(decode != nil, "Requires that '\(T.self)' conform to 'Decodable'.")
        return try decode?.init(self) as? T
    }
}