Project Euler Problem One If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Find the sum of all the multiples of 3 or 5 below 1000.

Project Euler Problem One.swift

func isGood(number: Int) -> Bool {
    return (number % 3 == 0 || number % 5 == 0)
}

Array(3...999)
    .filter { (number) in isGood(number) }
    .reduce(0) { (total, number) in total + number }

var sum = 0
for(var i = 0 ; i < 1000 ; i++) {
if i % 5 == 0 || i % 3 == 0 {
sum += i
}
}
print(sum)