Programming in Swift: Fundamentals

Oct 19 2021 Swift 5.5, iOS 15, Xcode 13

Part 3: Control Flow

22. Iterating Collections

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Previous episode: 21. Challenge: For Loops Next episode: 23. Challenge: Iterating Collections

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

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Now, you’ve probably figured out that loops must be useful for more things than just counting up from zero to nine, or printing strings a certain number of times.

for i in 0...
for i in 0...daysOfTheWeek.count {
    
}
for i in 0...daysOfTheWeek.count {
  print("\daysOfTheWeek[i]: \poolTemperature[i]")
}
for i in 0..<daysOfTheWeek.count {
  print("\(daysOfTheWeek[i]): \(poolTemperature[i])")
}
for i in 0..<daysOfTheWeek.count where poolTemperature[i] >= 80 {
  print("\(daysOfTheWeek[i]): \(poolTemperature[i])")
}
var sum = 0
for temperature in poolTemperature {
}
for temperature in poolTemperature {
    sum += temperature
}
sum / poolTemperature.count