Scala Queue forall() method with example

The forall() method is utilized to check if a predicate holds true for all the elements of the queue.

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

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

Example #1:

// Scala program of forall()
// method

// Import Queue
import scala.collection.mutable._

// Creating object
object GfG
{

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

        // Creating queues
        val q1 = Queue(1, 3, 2, 7, 6, 5)

        // Print the queue
        println(q1)

        // Applying forall method
        val result = q1.forall(x => {x % 7 == 0})

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

Output:

Queue(1, 3, 2, 7, 6, 5)
All the elements are divisible by 7: false

Example #2:

// Scala program of forall()
// method

// Import Queue
import scala.collection.mutable._

// Creating object
object GfG
{

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

        // Creating queues
        val q1 = Queue(1, 3, 7, 5)

        // Print the queue
        println(q1)

        // Applying forall method
        val result = q1.forall(x => {x % 2 != 0})

        // Displays output
        print("All the elements are odd: " + result)
    }
}

Output:

Queue(1, 3, 7, 5)
All the elements are odd: true