Make a Swift Array conform to Decodable (for JSON parsing)

Array+Decodable.swift

typealias JSON = Any

public protocol Decodable {
	init?(_ json: JSON)
}

extension Array: Decodable {

	public init?(_ json: JSON) {

		guard let jsonArray = json as? [JSON] else {
			return nil
		}

		if let decodableType = Element.self as? Decodable.Type {

			self.init()

			let elements = jsonArray.flatMap { json in
				return decodableType.init(json) as? Element
			}

			self.append(contentsOf: elements)

		} else {

			return nil
		}

	}

}


//Usage:
struct User: Decodable {
	
	let name: String
	
	init?(_ json: JSON) {
		
		guard let jsonDict = json as? [String: Any], let name = jsonDict["name"] as? String else {
			return nil
		}
		
		self.name = name
	}
}

//Let's say you got a JSON array of User objects
let usersJSON: JSON

let users = [User](usersJSON)