5-Day Swift Coding Challenge: Day 2

Oct 21 2025 · Swift 6.0, iOS 18, Swift Playground 4.6

Lesson 01: Day 2: Exploring Control Flow

Demo: Loops & Arrays

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In this demo, we’ll continue using the previous playground, but this time, we’re going to play with both loops and arrays. You saw the while loop. Let’s put this in practice. Add the following:

var sum = 1

while sum < 1000 {
  sum = sum + (sum + 1)
}
print(sum)

var sum = 1
var iterations = 0

while sum < 1000 {
  sum = sum + (sum + 1)
  iterations = iterations + 1
}
print(sum)
print(iterations)

for i in 1...3 {
  print(i)
}

var animals = [ "🐕", "🐁", "🐄" ]

var animals: [String] = [ "🐕", "🐁", "🐄" ]

animals.append(1)

animals.append("🐓")

animals[0]

animals.first

animals.last

animals.count

for i in 0...animals.count {
  print(animals[i])
}

for i in 0...animals.count - 1 {
  print(animals[i])
}

for animal in animals {
  print(animal)
}
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