notes.swift

// Why optionals as a type in Swift? Because Swift dissalows nil values in all other types!
// So the question is, under what circumstances does a value need to be nil?

//: 1. A method that cannot return a value
var y: Int
var s1: String
var s2: String

s1 = "123"
s2 = "ABC"

y = Int(s1) //this shit should throw warnings in xcode
y = Int(s2) //this too

//: 2. Properties that cannot be initialized when an object is constructed
class ViewController: UIViewController {
    //var button: UIButton // button is a regular Swift variable, so cannot store a nil value
}

//Use a ? after type declaration to declare var or let as optionals

// Exclamation mark implicitly unwraps optionals, basically throwing a fatal error if the object ever has a nil value

//So why use such a volatile optional?