Kotlin Programming: The Big Nerd Ranch Guide, First Edition

For the More Curious: Profiling

When the speed of code is an important consideration, Kotlin provides utility functions for profiling code performance: measureNanoTime and measureTimeInMillis. Both functions accept a lambda as their argument and measure the execution speed of the code contained within the lambda. measureNanoTime returns a time in nanoseconds, and measureTimeInMillis returns a time in milliseconds.

Wrap the function to measure in one of the utility functions like so:

    val listInNanos = measureNanoTime {
        // List functional chain here
    }

    val sequenceInNanos = measureNanoTime {
        // Sequence functional chain here
    }

    println("List completed in $listInNanos ns")
    println("Sequence completed in $sequenceInNanos ns")