How to check object is nil or not in swift?

Question

Suppose I have String like :

var abc : NSString = \"ABC\"

and I want to check that it is nil or not and for that I try :

if         


        

Answer 1

Swift short expression:

var abc = "string"
abc != nil ? doWork(abc) : ()

or:

abc == nil ? () : abc = "string"

or both:

abc != nil ? doWork(abc) : abc = "string"