Programming in Swift: Fundamentals

Oct 19 2021 · Swift 5.5, iOS 15, Xcode 13

Part 1: Core Concepts

07. Optionals

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Previous episode: 06. Challenge: Logical Operators Next episode: 08. Challenge: Optionals

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Notes: 07. Optionals

Update Notes: The student materials have been reviewed and are updated as of October 2021.

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Optionals can be a point of confusion for beginners in Swift.

var petName: String
petName = "Mango""
petName = nil
var result: Int? = 30
print(result + 1)
var petName: String? = "Mango"
var petAge: Int? = 7
var unwrappedPetName = petName!
print("The pet's name is \(unwrappedPetName)")
var petName: String? = nil // "Mango"
if let unwrappedPetName = petName {

} else {

// type this above the if let
if petName != nil {
  let unwrappedPetName = petName
if let petName = petName {

if let petName = petName,
   let petAge = petAge {

} else {

    print("The pet is \(petName) and they are \(petAge)")
} else {
    print("No pet name or age")
var optionalInt: Int? = 10
var requiredResult = optionalInt ?? 0
 nil //10