The optional values for subscripts can be accessed by referring their subscript values. It
can be accessed as subscript[0], subscript[1] etc. The default subscript values for 'radius'
are first assigned as [35, 45, 78, 101] and for 'Circle' [90, 45, 56]]. Then the subscript
values are changed as Radius[0] to 78 and Circle[1] to 45.
Linking Multiple Levels of Chaining
Multiple sub classes can also be linked with its super class methods, properties and
subscripts by optional chaining.
Multiple chaining of optional can be linked:
If retrieving type is not optional, optional chaining will return an optional value. For
example if String through optional chaining it will return String? Value
class rectangle {
var print: circle?
}class circle {
var area = [radius]()
var cprint: Int {
return area.count
}
subscript(i: Int) - > radius {
get {
return area[i]
}
set {
area[i] = newValue
}
}
func circleprint() {
println("The number of rooms is \(cprint)")
}
var rectarea: circumference?
}class radius {
let radiusname: String
init(radiusname: String) { self.radiusname = radiusname }