Lambda in Kotlin

fun main() {
    var list = (1..10).toList()
    val sum = list.customSum { it % 2 == 1 }
    println("The sum is: $sum")
}

fun List<Int>.customSum(sumFunction: (Int) -> Boolean): Int {
    var result = 0;
    for(i in this) {
        if (sumFunction(i)) {
            result += i
        }
    }
    return result
}