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Tomas Salas
Front End Web Development Techdegree Graduate 37,934 PointsCode challenge with while loop in swift, confusion.
THIS IS MY CODE
let numbers = [2,8,1,16,4,3,9] var sum = 0 var caunter = 0
while counter < numbers.count { print(counter) counter++ }
SOLUTION FOR THE CHALLENGE
let numbers = [2,8,1,16,4,3,9] var sum = 0 var counter = 0
while counter < numbers.count { sum += numbers[counter]; counter++
}
so I was not even close to the solution but still want to understand three things; why the solution code does't use print ?, what is print ? , why is the code, inside the body of the while loop, telling the computer to do? in this steps "sum+=numbers" "[counter]"
Somebody can help noob guy here ? xD
4 Answers
Connor Crawford
6,405 PointsOkay well first, print is basically just a way to test your code and see if something within a statement is running properly. In this particular example the while loop is telling the sum variable to increase by the returned indexed value of the array. The [counter] part is what tells the numbers array which index to return to then add to sum. As long as the counter variable which is being incremented is less than the number of items in the array, the array will return the value of counter as an indexed value. If I were to make an array of numbers lets say... let arrayOfNumbers = [1,2,3,4]. and I then wanted to return a value in that array.. lets say the number 2.. I would write arrayOfNumbers[1]. In this case 1 is "hard coded" while in your example it is a variable [counter] that is changing from the ++ operator. Hope that helps!
Ollie King
10,194 PointsCould it be as simple as it's failed to run because your spelling of "counter' in your code initially was spelt "caunter", so when you refer to "counter" (spelt correctly) it isn't finding the variable?
Tomas Salas
Front End Web Development Techdegree Graduate 37,934 Pointsthx, on other thing you are saying that print i just a way to test your code, but is to away to communicate something to the user ?
Connor Crawford
6,405 PointsI could just tell you but really you should just go hop in Xcode and experiment with print and return. Keep chuggin along ??
Tomas Salas
Front End Web Development Techdegree Graduate 37,934 Pointsthe var caunter don't worry is just I had the code in playground and I already had var call counter but when I put in the challenge I made the correction.