measureNanoTime

JVM
1.0
inline fun measureNanoTime ( block : ( ) -> Unit ) : Long
(source)
Native
1.3
@DeprecatedSinceKotlin ( "1.9" ) inline fun measureNanoTime (
block : ( ) -> Unit
) : Long

(source)
Deprecated: Use measureTime() instead.
For JVM

Executes the given block and returns elapsed time in nanoseconds.

import kotlin.system.*

fun main(args: Array<String>) {
//sampleStart
var sqrt = 0
val number = 1000
val timeInNanos = measureNanoTime {
    while (sqrt * sqrt < number) sqrt++
}
println("(The operation took $timeInNanos ns)")
println("The approximate square root of $number is between ${sqrt - 1} and $sqrt")
//sampleEnd
}
For Native

Executes the given block and returns elapsed time in nanoseconds.

This function is deprecated. To measure the duration of execution of a block of code, use measureTime or measureTimedValue instead. The resulting Duration then can be expressed as a Long number of nanoseconds using Duration.inWholeNanoseconds .

import kotlin.system.*

fun main(args: Array<String>) {
//sampleStart
var sqrt = 0
val number = 1000
val timeInNanos = measureNanoTime {
    while (sqrt * sqrt < number) sqrt++
}
println("(The operation took $timeInNanos ns)")
println("The approximate square root of $number is between ${sqrt - 1} and $sqrt")
//sampleEnd
}