Factorial

factorial.swift

func factorialRecursive(_ number: Int) -> Int {
    if number < 3 {
        return  number
    }
    return number * factorialRecursive(number - 1)
}

func factorialIterative(_ number: Int) -> Int {
    var result = 1
    for i in (2...number) {
        result *= i
    }
    return result
}