Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

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.

iOS Swift Collections and Control Flow Control Flow With Loops Working With Loops

In this task, we have an array of numbers and we want to compute the sum of its values.

In this task, we have an array of numbers and we want to compute the sum of its values.

We have a variable ,sum, that will store the value of the sum of numbers from the array.

We also have a variable ,counter, which we will use to track the number of iterations of the while loop.

Step 1: Create a while loop. The while loop should continue as long as the value of counter is less than the number of items in the array. (Hint: You can get that number by using the count property)

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

// Enter your code below

while counter <numbers.count{
    sum = sum + numbers[counter]
    counter++ }
Joe Hernandez
Joe Hernandez
5,699 Points

I believe counter++ doesn't work. try counter+=1

I know in Java counter++ works.

Courses Plus Student 11,316 Points

Yeah, ++ was removed (deprecated) in Swift 3, so += 1 is your answer.

The other issue is that you need a space between < and numbers.count. (And mine as well throw a space after numbers.count)... I think it's trying to evaluate <numbers.count (with no space).

Hope that helps.

1 Answer

++ is now deprecated. Try: