Roadblock...

Question

I took some of this code from this forum (https://teamtreehouse.com/community/working-with-loops-challenge-task-2-of-2) to try and better understand it, but i'm still having issues.  I understand everything up to line 8. I don't get where newValue came from. I understand the concept of it but I don't know how to add the value of each individual number from the array to the sum. Could someone please further explain? Also, in the forum counter ++ was used, but it hasn't been taught before and I'm also getting a syntax error on that. Could someone tell me what to replace it with and what it does and how it works? I know its a lot but I would really appreciate if someone could answer these questions in depth. Thanks!!!
```loops.swift
let numbers = [2,8,1,16,4,3,9]
var sum = 0
var counter = 0
// Enter your code below
var index = 0
while counter < numbers.count {
    sum = sum + newValue
        counter ++ 
}
```

Magnus Hållberg · Answer

The "newValue" variable is a placeholder name the challenge explanation use to explain the syntax and the ++ is just the former way of saying "+= 1". So the code you are asking about should look like below from Swift 3 and on: 
```swift
let numbers = [2,8,1,16,4,3,9]
var sum = 0
var counter = 0
// Enter your code below
var index = 0
while counter < numbers.count {
    sum = sum + numbers[counter]
        counter += 1
}

You could also update the sum value like this:
swift
    sum += numbers[counter]
```
Hope this helps

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Ryan Rassoli

Ryan Rassoli

Roadblock...

1 Answer

Magnus Hållberg

Magnus Hållberg