OrderingByDemo.scala

// resolvers += "Sonatype OSS Snapshots" at "https://oss.sonatype.org/content/repositories/snapshots"
// libraryDependencies += "com.github.ichoran" % "thyme_2.12" % "0.1.2-SNAPSHOT"
import ichi.bench._

import java.util.UUID


object OrderingByDemo extends App {
  println(util.Properties.versionString)

  // Create a custom data type Foo and fill an Array with arbitrary values
  case class Foo(int: Int, number: Long, string: String)

  val r = scala.util.Random
  r.setSeed(0L)

  val array: Array[Foo] = Array.fill(1000000) {
    val uuid = java.util.UUID.randomUUID()
    Foo(r.nextInt, uuid.getLeastSignificantBits, uuid.toString)
  }

  // Define equivalent Orderings different ways on Foo
  val orderingBy: Ordering[Foo] = Ordering.by(_.int)
  val orderingFromLessThan: Ordering[Foo] = Ordering.fromLessThan(_.int < _.int)
  val orderingCustom: Ordering[Foo] = new Ordering[Foo] {
    override def compare(x: Foo, y: Foo): Int = {
      if (x.int < y.int) -1
      else if (y.int < x.int) 1
      else 0
    }
  }

  // Run microbenchmarks
  val th = Thyme.warmed(verbose = print)

  th.pbench(array.sorted(orderingBy), title="Ordering.by")
  th.pbench(array.sorted(orderingFromLessThan), title="Ordering.fromLessThan")
  th.pbench(array.sorted(orderingCustom), title="custom Ordering")
}