BabbiesFirstKotlin - JVM just got more fun

babbies.kt

fun innerExpr(item: Int, mean: Int): Int {
    return (item - mean) * (item - mean)
}

fun stdDev(items: List<Int>): Double {
    val mean = items.sum() / items.size
    val variance = items.map { innerExpr(it, mean) }.sum() / items.size

    return Math.sqrt(variance.toDouble())
}

fun main(args: Array<String>) {
    val stuff = listOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
    val res = stdDev(stuff)
    print("StdDev of 1-10: $res")
}