Programming in Swift: Fundamentals

Oct 19 2021 Swift 5.5, iOS 15, Xcode 13

Part 4: More Collections

29. Accessing & Working with Dictionaries

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Previous episode: 28. Creating & Populating Dictionaries Next episode: 30. Challenge: Dictionaries

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Apple’s Swift Dictionary documentation: https://developer.apple.com/documentation/swift/dictionary

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

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Hey - welcome back! In the previous video, you learned about how to create dictionaries, how key-value storage works, and how to add and update elements in your dictionary. But there’s a whole lot more to dictionaries than just that!

namesAndPets["Rincewind"]

namesAndPets["Captain Ahab"]

let captainAhabPet = namesAndPets["Captain Ahab"] ?? "No white whale for Captain Ahab"

namesAndPets.isEmpty

namesAndPets.count

namesAndPets.removeValue(forKey: "Goku")

namesAndPets["Hiccup"] = nil

print(namesAndPets)

for (character, pet) in namesAndPets {

}

for (character, pet) in namesAndPets {
  print("\(character) has a \(pet)")
}

for (name, _) in namesAndPets {
  print(name)
}

print("---")

for pet in namesAndPets.keys {
  print(pet)
}

for pet in namesAndPets.values {
  print(pet)
}