Programming in Swift: Fundamentals

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

Part 4: More Collections

28. Creating & Populating Dictionaries

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Previous episode: 27. Introduction Next episode: 29. Accessing & Working with Dictionaries

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Notes: 28. Creating & Populating Dictionaries

Apple’s Swift Dictionary documentation:

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

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You’re ready to learn about another extremely useful collection type in Swift: dictionaries.

var emptyDictionary: [String: Int] = [:]
var namesAndPets = ["Ron": "🐀 Rat"]
var namesAndPets = ["Ron": "🐀 Rat", "Rincewind": "🛄 Luggage", "Thor": "🔨 Hammer", "Goku": "☁️ Flying Nimbus"]
namesAndPets.updateValue("🐶 Mango", forKey: "Chris")
namesAndPets["Calvin"] = "🐯 Tiger"
namesAndPets.updateValue("Owl", forKey: "Ron")
namesAndPets["Ron"] = "🦉 Owl"