Swift Tutorial - Tutorialspoint

var mark1 = 300

var mark2 = 400

var mark3 = 900

}

let marks = studentMarks()

println("Mark1 is \(marks.mark1)")

println("Mark2 is \(marks.mark2)")

println("Mark3 is \(marks.mark3)")

When we run the above program using playground, we get the following result:

Mark1 is 300

Mark2 is 400

Mark3 is 900

Class Identity Operators

Classes in Swift refers multiple constants and variables pointing to a single instance. To
know about the constants and variables pointing to a particular class instance identity
operators are used. Class instances are always passed by reference. In Classes NSString,
NSArray, and NSDictionary instances are always assigned and passed around as a
reference to an existing instance, rather than as a copy.

Identical to Operators Not Identical to Operators

Operator used is (===) Operator used is (!==)

Returns true when two constants or

variables pointing to a same instance

Returns true when two constants or

variables pointing to a different instance

class SampleClass: Equatable {

let myProperty: String

init(s: String) {

myProperty = s

}

}

func ==(lhs: SampleClass, rhs: SampleClass) - > Bool {

return lhs.myProperty == rhs.myProperty

}