how to check if one property of entity model return nil in swift

Question

I'm new in swift.

I have a object of entity example: var person=Person()

person have name, but docent have a lastName. how to check if person.lastName is nil, I have tried but dosen't work . please help

Answer 1

var lastName:String?;

if (person.lastName == nil)
{
  //Do something.
}
else
{
   //Do something
}