How to make extensions to Swift Optional Object ?

Understanding Swift Optional implementation

If you are looking for basic option usage, Please go here.

The Optional in swift is implement as enum with actual variable as temple enum parameter. The actual implementation of enum is here.

public enum Optional<Wrapped>: ExpressibleByNilLiteral {
  case none
  case some(Wrapped)
} 
// implementation: https://github.com/apple/swift/blob/master/stdlib/public/core/Optional.swift

All the variable defined as optional(e.g. Int?, String? etc) are basically ‘Optional’ enum. As we know enum are extensible, we can extend to add more properties to it.

Extending Optional for All Object:

extension Swift.Optional {
  var isNull: Bool {
     switch self {
       case .none:
         return true
       case .some:
         return false
      }
  }
}
////OR
extension Swift.Optional {
      var isNull: Bool {
         return self == nil
      }
}

Extending Optional for Specific Protocol type:

If we want Optional property only applicable to specific protocol like Collection(i.e. Arrays, Strings etc). We can attach condition to Wrapped object like following:

extension Swift.Optional where Wrapped: Collection {
    var isNilOrBlank: Bool {
         switch self {
             case .none:
                 return true…