While Loop

Sometimes you don't know exactly how many times a loop should run. Instead, you want to keep looping while a condition remains true. That's where the while loop comes in.

var count = 1

while count <= 3 {
    print(count)
    count += 1
}
// Output: 1, 2, 3 (each on a new line)

The loop checks the condition count <= 3 before each iteration. As long as it's true, the code inside runs. Once the condition becomes false, the loop stops.

Be careful: if the condition never becomes false, you'll create an infinite loop! Always make sure something inside the loop eventually changes the condition:

var number = 10

while number > 0 {
    print(number)
    number -= 2
}
// Output: 10, 8, 6, 4, 2

Use a while loop when the number of iterations depends on a condition that changes during execution, rather than a fixed range.