Scala Iterator forall() method with example

The forall() method belongs to the concrete value members of the Class AbstractIterator. It is defined in the class IterableOnceOps. It tests whether a used predicate holds for all the elements of the stated collection. It may not terminate for the infinite sized collection.

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

Return Type : It returns true if the stated collection is empty or if the given predicate p holds for all elements of this collection, else it returns false.

Example #1:

// Scala program of forall()
// method

// Creating object
object GfG
{

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

        // Creating an Iterator
        val iter = Iterator(3, 6, 15, 12, 21)

        // Applying forall method
        val result= iter.forall(x => {x % 3 == 0})

        // Displays output
        println(result)

    }
}

Output:

true

Example #2:

// Scala program of forall()
// method

// Creating object
object GfG
{

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

        // Creating an Iterator
        val iter = Iterator(3, 6, 15, 19, 21)

        // Applying forall method
        val result= iter.forall(x => {x % 3 == 0})

        // Displays output
        println(result)

    }
}

Output:

false