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# About the while loop challenge

After I successfully completed the challenge(with the numbers.count method), I tried another way/expression but it didn't work out, which I don't get why.

Q: Given an array of numbers, print out each number in the array using a while loop and the println statement.

```let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

var dex = 0

while numbers[dex] < 11 {

println(numbers[dex])

dex++

}
```

Thank you!!

Did you actually write `println(numbers[dex]) dex++` on one line like that? If so, that's your problem.

Edit: OK, now that I'm looking at this again, I see the issue. If you think about what will happen as you go through the while loop, you'll see what happens:

• 1st time through: checks if numbers[0], which is 1, is less than 11, which it is
• 2nd time through: checks if numbers[1], which is 2, is less than 11, which it is

...

• 10th time through: checks if numbers[9], which is 10, is less than 11, which it is

• 11th time through: checks if numbers[10] is less than 11 - gets an error because numbers[10] doesn't exist

Make sense?

Hi Greg, I actually broke them into 2 lines like this. Sorry I didn't notice the change in this post.

{println(numbers[dex])

dex++

}

Did you try this in Xcode? It looks like it's correct, and should work.

I've found that with these challenges they look at more than just the output sometimes. I suspect they want you to learn the "preferred" method.