Scala List :::() operator with example

The :::() operator in Scala is utilized to join the List in the argument to the another List.

Method Definition: def :::(prefix: List[A]): List[A]

Return Type: It returns a list after joining one list to the another one.

Example #1:

// Scala program of :::()
// method

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {

        // Creating two lists
        val m1 = List(1, 2, 3)
        val m2 = List(4, 5, 6)

        // Applying ::: operator
        val res = m1.:::(m2)

        // Displays output
        println(res)

    }
}

Output:

List(4, 5, 6, 1, 2, 3)

Example #2:

// Scala program of :::()
// method

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {

        // Creating two lists
        val m1 = List(1, 2, 3)
        val m2 = List()

        // Applying ::: operator
        val res = m1.:::(m2)

        // Displays output
        println(res)

    }
}

Output:

List(1, 2, 3)