CHALLENGE

Write a function called sumOfDigits that given an integer, returns the sum of its digits. If you need an extra challenge, find a solution that works without using Strings.

Example
sumOfDigits(23) // returns 5
sumOfDigits(496) // returns 19


ASSUMPTIONS
1. There will be no negative numbers
2. Will only be given integers


TEST CASES
sumOfDigits(23) // returns 5
sumOfDigits(496) // returns 19
sumOfDigits(402) // returns 6
sumOfDigits(1) // returns 1


CODING APPROACH
Use compactMap to go through each item in the integer and put it into an array. Do a for-in loop to loop through all of the integers in the array and add them together.

CODE

func sumOfDigits(fullInt: Int) {

    let fullIntString = "\(fullInt)"

    let arrayOfDigits = fullIntString.map { Int(String($0))}

    for eachDigit in arrayOfDigits {
        let sum = sum + eachDigit
    }

    return sum

}

sumOfDigits(fullInt: 429)