PricingLoginStart free
Swift Academy · Lesson

Loops — for-in, while, repeat-while

Learn how to repeat tasks with for-in , while , and repeat-while loops.

Lesson 3 of 38 steps

Loops — for-in, while, repeat-while is a free Swift Academy lesson on CoddyKit. This is lesson 3 of 3. Any 3 lessons of this learning path are free to read in full — after that, CoddyKit PRO unlocks every lesson, plus hands-on practice with a built-in code editor and a 24/7 AI tutor. It is part of the Swift Academy learning path, and your progress syncs across the web and the CoddyKit app. The Swift Academy course includes 3 lessons in total.

Intro

Loops repeat code. Swift provides for-in, while, and repeat-while.

for-in loop

for-in iterates over ranges, arrays, or any sequence.

for i in 1...3 {
    print("i =", i)
}

while loop

while repeats as long as the condition is true, checking before each run.

var n = 3
while n > 0 {
    print("n =", n)
    n -= 1
}

repeat-while loop

repeat-while checks the condition after running the body, so it always runs at least once.

var count = 0
repeat {
    print("count =", count)
    count += 1
} while count < 3

break & continue

Use continue to skip, break to exit a loop early.

for i in 1...5 {
    if i == 3 { continue }  // skip 3
    if i == 4 { break }     // stop loop
    print("i =", i)
}

Tips

Tips:

  • Prefer for-in for known sequences.
  • Use while for unknown counts.
  • Use repeat-while when the body must run at least once.

Loop guarantee

Quick check: Which loop guarantees the body runs at least once?

Answer it in the interactive lesson

Recap

Recap: Use for-in for sequences, while for unknown repeats, repeat-while to run at least once.

Free to start

Learn Swift with an AI tutor — free

Write and run real code in your browser, get instant help from a 24/7 AI tutor, and pick up where you left off on the web or in the app.

Courses
122
Lessons
409
Start learning freeView the full course

Frequently Asked Questions

Is the “Loops — for-in, while, repeat-while” lesson free?

Yes — any 3 lessons of the Swift Academy learning path, including “Loops — for-in, while, repeat-while”, are free to read in full here on the web. After that, CoddyKit PRO unlocks every lesson, plus interactive practice with a built-in code editor and a 24/7 AI tutor. The Swift Academy course includes 3 lessons in total.

What will I learn in “Loops — for-in, while, repeat-while”?

Learn how to repeat tasks with for-in , while , and repeat-while loops. You practise Swift Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Swift Academy?

No prior experience is required. Swift Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 3 of 3.

How long does the “Loops — for-in, while, repeat-while” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Swift Academy lesson?

Yes. Every Swift Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. if/else basics
  2. switch — exhaustiveness, ranges, tuples, where
  3. Loops — for-in, while, repeat-while
← Back to Swift Academy