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# Stuck, Swift Collections Control Flow

Task 2 of 2 asks: Now that we have the while loop set up, it's time to compute the sum! Using the value of counter as an index value, retrieve each value from the array and add it to the value of sum.

For example: sum = sum + newValue. Or you could use the compound addition operator sum += newValue where newValue is the value retrieved from the array.

I have this (for task 1 of this challenge):

```while counter < numbers.count{
sum =
counter++
}
```

But cannot figure out task 2. Thank you!

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

while counter < numbers.count{

counter++
}
```

There are a couple of ways to do this. Let's walk through this in code

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

while counter < numbers.count{
// inside the loop we need to add the number from our array
// during each iteration to the sum
// let's first get the number from our array
var newValue = numbers[counter] // this will assign the value from the array at an incrementing index based on counter
// next let's add that value to out running total for sum
sum += newValue
// then we increment the counter
counter++
}
```