How To Compute Williams %R using Scala?

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def williamsR(highPrices: List[Double], lowPrices: List[Double], closePrices: List[Double], period: Int): List[Double] = {
    highPrices.zip(lowPrices).zip(closePrices).map { case ((high, low), close) =>
        val hh = highPrices.slice(0, period).max
        val ll = lowPrices.slice(0, period).min

        ((hh - close) / (hh - ll)) * -100
    }
}

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val highPrices = List(10.0, 12.0, 15.0, 14.0, 16.0)
val lowPrices = List(8.0, 10.0, 12.0, 11.0, 12.0)
val closePrices = List(9.0, 11.0, 14.0, 13.0, 15.0)
val period = 5

val williamsRValues = williamsR(highPrices, lowPrices, closePrices, period)
println(williamsRValues)