A functional line count.

LineCount.kt

import java.io.File

fun main(args: Array<String>) {
    args.map { name -> File(name) }
        .filter { file -> file.isFile }
        .map { file -> Pair(file.name, file.readLines().partition { line -> line.trim().isEmpty()  }) }
        .forEach {
            val name = it.first
            val (filledLines,emptyLines) = it.second
            println("$name: ${filledLines.size+emptyLines.size} total, ${emptyLines.size} empty")
        }
}