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pawelkijowskizimperium/digitalRoot.swift

Last active December 10, 2018 02:20
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Efficient digital root
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digitalRoot.swift
import UIKit
func digitalRoot(of number: Int) -> Int {
if (number <= 0) {
return number
} else if (number % 9 == 0) {
return 9
} else {
return number % 9
}
}
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