Scala example source code file (t3361.scala)

This example Scala source code file (t3361.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

app, app, doublelinkedlist, doublelinkedlist, illegalargumentexception, illegalargumentexception, test, test

The Scala t3361.scala source code

object Test extends App {
  import scala.collection.mutable.DoubleLinkedList

  empty
  builder_1
  builder_2
  chaining_1
  chaining_2
  insert_1
  insert_2
  append_1
  append_2

  def empty {
    val none = DoubleLinkedList()
    require(none.size == 0)
    none.foreach( _ => require(false))
  }

  def builder_1 {
    val ten = DoubleLinkedList(1 to 10: _*)
    require(10 == ten.size)
  }

  def builder_2 {
    val ten = DoubleLinkedList(1 to 10: _*)
    require((ten.size*(ten.size+1))/2 == ten.reduceLeft(_ + _))
  }

  def chaining_1 {
    val ten = DoubleLinkedList(1 to 10: _*)
    require(ten.reverse == DoubleLinkedList((1 to 10).reverse: _*))
  }

  def chaining_2 {
    val ten = DoubleLinkedList(1 to 10: _*)
    require(ten == ten.reverse.reverse)
  }

  def insert_1 {
    val ten = DoubleLinkedList(1 to 10: _*)
    ten.append(DoubleLinkedList(11))
    
    // Post-insert size test
    require(11 == ten.size)
    // Post-insert data test
    require((ten.size*(ten.size+1))/2 == ten.reduceLeft(_ + _))
    // Post-insert chaining test
    require(ten == ten.reverse.reverse)
    // Post-insert position test
    require(ten.last == 11)
  }

  def insert_2 {
    val ten = DoubleLinkedList(1 to 10: _*)
    try {
      DoubleLinkedList().insert(ten)
    } catch {
      case _: IllegalArgumentException => require(true)
      case _ => require(false)
    }
    val zero = DoubleLinkedList(0)
    zero.insert(ten)
    require(zero.size == 11)
    require(zero.head == 0)
    require(zero.last == 10)
  }

  def append_1 {
    val ten = DoubleLinkedList(1 to 10: _*)
    val eleven = ten.append(DoubleLinkedList(11))
    // Post-append equality test
    require(ten == eleven)
    // Post-append size test
    require(11 == ten.size)
    // Post-append data test
    require((ten.size*(ten.size+1))/2 == ten.reduceLeft(_ + _))
    // Post-append chaining test
    require(ten == ten.reverse.reverse)
    // Post-append position test
    require(ten.last == 11)
  }

  def append_2 {
    val ten = DoubleLinkedList(1 to 10: _*)
    try {
      DoubleLinkedList().append(ten)
    } catch {
      case _: IllegalArgumentException => require(true)
      case _ => require(false)
    }
    val zero = DoubleLinkedList(0)
    zero.append(ten)
    require(zero.size == 11)
    require(zero.head == 0)
    require(zero.last == 10)
  }
}