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Scala program to merge the elements of two List collections

Here, we are going to learn how to merge the elements of two List collections in Scala programming language?
Submitted by Nidhi, on June 21, 2021 [Last updated : March 11, 2023]

Scala – Merge Two List Collections

Here, we will create two lists of integers using List collection. Then merge both lists and print the merged list on the console screen.

The List collection is used to store ordered elements. It extends the LinearSeq trait and is used for the immutable linked list.

Scala code to merge the elements of two List collections

The source code to merge two integer lists is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Scala program to merge two integer lists

import scala.collection.immutable._

object Sample {
  // Main method
  def main(args: Array[String]) {
    var intList1 = List(0, 1, 2, 3, 4);
    var intList2 = List(5, 6, 7, 8, 9);

    //Merge two lists
    var intList3 = intList1 ++ intList2;

    println("List1:");
    intList1.foreach((item: Int) => print(item + " "));
    println();

    println("List2:");
    intList2.foreach((item: Int) => print(item + " "));
    println();

    println("Merged List:");
    intList3.foreach((item: Int) => print(item + " "));
    println();
  }
}

Output

List1:
0 1 2 3 4 
List2:
5 6 7 8 9 
Merged List:
0 1 2 3 4 5 6 7 8 9 

Explanation

In the above program, we used an object-oriented approach to create the program. Here we imported Collection classes using below statement,

import scala.collection.immutable._

Here, we also created a singleton object Sample and defined the main() function. The main() function is the entry point for the program.

In the main() function, we created two lists intList1, intList2 using List collection. Then we merged intList1 and intList2 using "++" operator. After that, we printed the elements of the merged list on the console screen.

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