Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

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

Maria Alonso
Maria Alonso
7,498 Points

dont understand

what is that i have to do

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

// Enter your code below

while counter < numbers.count {
  [counter += 1] = sum + 2 + 8 + 1 + 16 + 4 + 3 + 9
}

1 Answer

Hi there,

You've got the loop correct; the last part of the loop code needs to be the increment of counter, as you have done - just put that on a separate line without the square brackets.

Now, the first line inside the loop needs to add an element of numbers into the accumulative variable named sum.

How to access numbers? Use counter inside square brackets, like numbers[counter]. Use += to add numbers[counter] into sum then increment counter as above.

Does that make sense?

Steve.