scala, 시간경과 확인

time.scala

import java.util.concurrent.TimeUnit.NANOSECONDS
def time[T](f: => T): T = {
    val start = System.nanoTime()
    val ret = f
    val end = System.nanoTime()
    // scalastyle:off println
    println(s"Time taken: ${NANOSECONDS.toMillis(end - start)} ms")
    // scalastyle:on println
    ret
}