Swift Tutorial - Tutorialspoint

class sides {

var rectsides: Int

init(rectsides: Int) { self.rectsides = rectsides }

}

let objects: [AnyObject] = [Circle(radius: 2.0),result(area:

198 ),sides(rectsides: 4 )]

for object in objects {

if let objectWithArea = object as? rectangle {

println("Area is \(objectWithArea.area)")

} else {

println("Rectangle area is not defined")

}

}

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

Area is 12.5663708

Area is 198.0

Rectangle area is not defined