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

Kang Min Kim
Kang Min Kim
461 Points

not sure how to complete task 2 the directions are kind of vague

Now that we have the while loop set up, it's time to compute the sum! 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.

Kang Min Kim
Kang Min Kim
461 Points

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

while sum < numbers.count { print(numbers[sum]) sum += 1

}

2 Answers

Dhanish Gajjar
Dhanish Gajjar
20,185 Points

You can use the same counter variable or create a new one that would represent the index value of the numbers array. The only difference is that you would have to increment that index variable along with the counter variable.

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

Hope this helps.

Kang Min Kim
Kang Min Kim
461 Points

hey Dhanish, Thanks you for responding to my question! Do you have any pointers when it comes to handling loops for some reason I have a difficult time wrapping my head around the concept?

Best, Kang

Dhanish Gajjar
Dhanish Gajjar
20,185 Points

You are welcome Kang Min Kim It takes a while and it's the exact same thing for everyone when they are starting out. What I can suggest is go through the videos again, do not use playground this time, just focus, listen carefully and try to understand. You can also read the Swift 3 book to find out more.

https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/ControlFlow.html#//apple_ref/doc/uid/TP40014097-CH9-ID120