Scala immutable TreeSet clear() method

In Scala immutable TreeSet class, the clear() method is utilized to delete all the elements of the TreeSet.

Method Definition: def clear(): Unit

Return Type: It returns an empty TreeSet.

Example #1:

// Scala program of clear()
// method

// Import TreeSet
import scala.collection.immutable._

// Creating object
object GfG
{

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

        // Creating TreeSet
        val t1 = TreeSet(2, 1, 3, 4, 5)

        // Print the TreeSet
        println("Before clear method: " + t1)

        // Applying clear() method
        val result = t1.clear

        // Displays output
        println("After clear method: " + result)

    }
}

Output:

Before clear method: TreeSet(1, 2, 3, 4, 5)
After clear method: ()

Example #2:

// Scala program of clear()
// method

// Import TreeSet
import scala.collection.immutable._

// Creating object
object GfG
{

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

        // Creating TreeSet
        val t1 = TreeSet("a", "e", "i", "o", "u")

        // Print the TreeSet
        println("Before clear method: " + t1)

        // Applying clear() method
        val result = t1.clear

        // Displays output
        println("After clear method: " + result)

    }
}

Output:

Before clear method: TreeSet(a, e, i, o, u)
After clear method: ()