While loop Swift

You've created an infinite loop. Your while loop will run an infinite amount of times always printing "1" because its condition will never change, as the variable "index" will always be smaller than "numbers.count", because it's always "0".

To help you understand, you're basically telling the program this: while index is less than this number, do this forever. This is what a while loop does. To exit this loop, index will have to change.

This is where the increment operator comes in use. By using index++ in your loop, you will tell index to increase every time it runs. Be sure to place it after the print line, so you don't miss that first element.

This will do two things -

1. Index will continue to step through the numbers array, because of println(numbers[index]). This will print out each number in the array.
2. Index will eventually become larger than numbers.count, which is the exact amount of elements in your array. This will stop the while loop right where you want it to stop.

Hope this helps you understand, feel free to ask if you have further questions.