Optionals say either "there is a value, and it equals x" or "there isn't a value at all". An Optional is a type on its own, actually one of Swift 4's new super-powered enums. It has two possible values, None and Some(T), where T is an associated value of the correct data type available in Swift 4.
//OPTIONALS MASTERCLASS
//If you want to create a variable with "no value" just add a "?", or "!", depending on the case.
//EXAMPLE
var number: Int?
print (number as Any)
//ANOTHER EXAMPLE THAT WILL NOT CRASH
let enteredText = "four"
let enteredTextInteger = Int (enteredText)
if let anotherText = enteredTextInteger{
print(anotherText * 2)
}else{
print("Please try again. Invalid input.")
}
Happy coding! :)
