Lost here: Using the value of counter as an index value, retrieve each value from the array and add it to the value of s

Question

Does that mean I need to retrieve the value of counter inside the while loop?

Also what is the code to retrieve a value?

Would is just be sum = numbers[1] ?

loops.swift

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

// Enter your code below
while counter < 1 {
    counter += 1
     sum += newValue
}

Answer 1 · 2018-01-14T18:31:21Z

January 14, 2018 6:31pm

Hello,

So the challenge wants you to use counter as the index to retrieve the numbers inside the array.

Why use counter ? The reason why we want to use the counter to retrieve those numbers is because we are going to make it Increase in value every time the loop runs.

The challenge also says to use the while loop and make it run as long as the counter is less than the amount of values inside the array. In this case we can use the instance method count.

while counter < numbers.count { // Here we check that counter is less than numbers array

 sum += numbers[counter] // We use counter as an index to retrieve the values

 counter += 1 // We add one number to counter
}

Things to remember:

To retrieve a value from an array you have to use its subscript.

let value = array[1]

A while loop will keep running until a condition is true.

Good luck, hope this helps

Welcome to the Treehouse Community

Looking to learn something new?

Chris Beal

Chris Beal

Lost here: Using the value of counter as an index value, retrieve each value from the array and add it to the value of s

1 Answer

Jhoan Arango

Jhoan Arango