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### Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today. # I am not sure how to complete this code challenge.

I am stuck on this code chellenge. I completed the objective before but do not think that what I coded is even write for what it was asking. If someone can help me complete this challenge and then explain why it is what it is that would be very helpful.

while.swift
```let numbers = [2,8,1,16,4,3,9]
var sum = 0
var counter = 0

while sum < 1     {
print(counter)
sum++
}
``` PLUS

Let me post the working code and go through it step by step.

```let numbers = [2,8,1,16,4,3,9]
var sum = 0
var counter = 0

// Loop as long as the counter is less than the number of elements
// in the array. Less than, as indices of arrays are zero based.
// Therefore, indices are 0 to 6 with this array, count returns 7
while counter < numbers.count    {

// numbers[counter] accesses the first element of the array with the
// first iteration. That would be numbers, numbers, numbers etc.
// As we increment counter with every iteration, we can use it to access
// each element of the array, one after another.

// With every iteration, we add the Int we get from the array to the sum
sum += numbers[counter]

// Increment the counter at the end of the loop
// Note that this is deprecated as of Swift 2
// and should now be counter += 1, just as we
// increment the sum
counter++
}
```

Hope that helps :)