Programming in Swift: Fundamentals

Oct 19 2021 Swift 5.5, iOS 15, Xcode 13

Part 4: More Collections

31. Working with Sets

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Previous episode: 30. Challenge: Dictionaries Next episode: 32. Challenge: Sets

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

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In this exercise, you’ll learn about a third and final collection type in Swift: sets.

var someSet: Set<Int>
//let someArray: Array<Int>
//let someDictionary: Dictionary<String, Int>
var someSet: Set<Int> = [1, 2, 3, 1]
someSet.contains(1)
someSet.contains(99)
someSet.insert(5)
someSet.remove(3)
let removedElement = someSet.remove(3)
let nilElement = someSet.remove(42)
someSet
let anotherSet: Set<Int> = [5, 7, 13]
let intersection = someSet.intersection(anotherSet)
let difference = someSet.symmetricDifference(anotherSet)
let union = someSet.union(anotherSet)
someSet.form
someSet.formUnion(anotherSet)
someSet
anotherSet