Scala immutable TreeSet –() method

In Scala immutable TreeSet class, the –() method is utilised to subtract elements of one TreeSet to another TreeSet.

Method Definition: def –(that: IterableOnce[A]): TreeSet[A]

Return Type: It returns a new TreeSet which contains the element from A – B TreeSets.

Example #1:

// Scala program of --()
// method

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

// Creating object
object GfG
{

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

        // Creating TreeSets
        val t1 = TreeSet("g", "e", "e", "k", "s")

        val t2 = TreeSet("a", "e", "i", "o", "u")

        // Print the TreeSets
        println(t1)

        println(t2)

        // Applying --() method
        val result = t1 -- t2

        // Display output
        print("Combined TreeSet: " + result)

    }
}

Output:

TreeSet(e, g, k, s)
TreeSet(a, e, i, o, u)
Combined TreeSet: TreeSet(g, k, s)

Example #2:

// Scala program of --()
// method

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

// Creating object
object GfG
{

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

        // Creating TreeSets
        val t1 = TreeSet(1, 6, 3, 2, 5)

        val t2 = TreeSet(2, 1, 5, 4, 1)

        // Print the TreeSets
        println(t1)

        println(t2)

        // Applying --() method
        val result = t1 -- t2

        // Display output
        print("Combined TreeSet: " + result)

    }
}

Output:

TreeSet(1, 2, 3, 5, 6)
TreeSet(1, 2, 4, 5)
Combined TreeSet: TreeSet(3, 6)