Convert Binary, Base X, to Decimal

BaseToDecimal.swift

func baseToDecimal(_ base: Int, notation : [Int]) -> Int {
    return notation.reversed().enumerated().filter { $0.element == 1 }.reduce(into: 0) {
        let powR = Int(pow(Float(base), Float($1.offset)))
        $0 += powR
    }
}

func decimal(_ d : Int, toBase base: Int) -> [Int] {
    var res = [Int]()

    var i = d
    while i >= 1 {
        let quotient = i / base
        let remainder = i % base
        
        if remainder > 0 {
            res.append(1)
        } else {
            res.append(0)
        }
        i = quotient
    }
    return res.reversed()
}