Swift Array extension to remove uncodable elements.

Array+FilterEncodable.swift

extension Array where Element: Encodable {
  /// - Returns: An array having removed any element of the array which is not encodable itself.
  func filterUncodable() -> [Element] {
    return self.filter { (el: Element) -> Bool in
      let encoded = try? JSONEncoder().encode(el)
      return encoded != nil ? true : false
    }
  }
}