Swift While Loop

Repeat code while a condition is true using while.

Use repeat { ... } while to check the condition after the loop body.

---

while

The while loop checks the condition before each iteration.

Example

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

This example counts down from 3 using a while loop.

---

---

repeat { } while

repeat runs the body first, then checks the condition.

Example

var attempts = 0
repeat {
  attempts += 1
  print("Attempt #\(attempts)")
} while attempts < 3

This example demonstrates repeat (do-while style).