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

I am confused

I am this far in this challenge. I need help. Someone please help me!!!! I'm stuck here for months!

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

// Enter your code below

while counter < 43 {
  counter += 1
}

This is the challenge: 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.

1 Answer

You need to use the count property on the numbers array to get the number of items, in this case Int numbers, the array contains.

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


while counter < numbers.count {
    sum = sum + numbers[counter]
    counter += 1

}