Scala immutable TreeSet forall() method

In Scala immutable TreeSet class, the forall() method is utilized to check if a predicate holds true for all the elements of the TreeSet.

Method Definition: def forall(p: (A) => Boolean): Boolean

Return Type: It returns true if the predicate holds true for all the elements of the TreeSet or else returns false.

Example #1:

// Scala program of forall()
// method

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

// Creating object
object GfG
{

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

        // Creating TreeSet
        val t1 = TreeSet(2, 4, 6, 7, 8, 9)

        // Print the TreeSet
        println(t1)

        // Applying forall() method
        val result = t1.forall(x => {x % 7 == 0})

        // Displays output
        println("All the elements are divisible by 7: " + result)

    }
}

Output:

TreeSet(2, 4, 6, 7, 8, 9)
All the elements are divisible by 7: false

Example #2:

// Scala program of forall()
// method

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

// Creating object
object GfG
{

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

        // Creating TreeSet
        val t1 = TreeSet(2, 4, 6, 8)

        // Print the TreeSet
        println(t1)

        // Applying forall() method
        val result = t1.forall(x => {x % 2 == 0})

        // Displays output
        println("All the elements are even: " + result)

    }
}

Output:

TreeSet(2, 4, 6, 8)
All the elements are even: true