can someone explain this part please(short code)

Question

Part i dont understand:
repeat {
output = digitNames[number % 10]! + output
number /= 10
} while number > 0

WHOLE CODE:
let digitNames = [
0: "Zero", 1: "One", 2: "Two", 3: "Three", 4: "Four",
5: "Five", 6: "Six", 7: "Seven", 8: "Eight", 9: "Nine"
]
let numbers = [16, 58, 510]
let strings = numbers.map { (number) -> String in
var number = number
var output = ""
repeat {
output = digitNames[number % 10]! + output
number /= 10
} while number > 0
return output
}
print(strings)
// strings is inferred to be of type [String]
// its value is ["OneSix", "FiveEight", "FiveOneZero"]

Answer 1

just repeating the stmt with modulo 10(reminder after dividing by 10) and dividing by 10 to get to each numbers(left to right) and concating.

for 16
output = dN[1]+dN[6]
first dN[6] and concatinated it to dN[1].

Answer 2

Dzondzula did it understand this?