performance.scala

package microbenchmarks

import org.scalameter.PerformanceTest
import org.scalameter.api._

import scala.collection.mutable.ArrayBuffer

object CollectionAppendBenchmark extends PerformanceTest.OfflineReport {
  val sizes: Gen[Int] = Gen.range("size")(100, 500, 100)

  var list = List.empty[Int]
  var array = ArrayBuffer.empty[Int]
  var vector = Vector.empty[Int]

  performance of "Vector" in {
    measure method ":+" in {
      using(sizes) in { s =>
        var max = 0
        while(max < s) {
          vector = vector :+ 1
          max += 1
        }
      }
    }
  }

  performance of "List" in {
//    measure method ":+" in {
//      using(sizes) in { s =>
//        var max = 0
//        while(max < s) {
//          list = list :+ 1
//          max += 1
//        }
//      }
//    }
    measure method ":: then reverse" in {
      using(sizes) in { s =>
        var max = 0
        while(max < s) {
          list = 1 :: list
          max += 1
        }
      }
      list.reverse
    }
  }

  performance of "ArrayBuffer" in {
    measure method ":+" in {
      using(sizes) in { s =>
        var max = 0
        while(max < s) {
          array = array :+ 1
          max += 1
        }
      }
    }
  }
}