Scala Iterator dropWhile() method with example

The dropWhile() method belongs to the concrete value members of the class Abstract Iterator. It is defined in the classes Iterator and IterableOnceOps. It drops the longest prefix of elements which satisfies the stated predicate.

Method Definition : def dropWhile(p: (A) => Boolean): Iterator[A]

Where, p is the predicate to be used.

Return Type : It returns the longest suffix of the stated iterator whose first element does not satisfies the used predicate.

Example #1:

// Scala program of dropWhile()
// method

// Creating object
object GfG
{

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

        // Creating an Iterator
        val iter = Iterator(2, 3, 4, 6, 7)

        // Applying dropWhile method
        val x = iter.dropWhile(x => {x < 5})

        // Applying next method
        val result = x.next()

        // Displays output
        println(result)
    }
}

Output:

6

Example #2:

// Scala program of dropWhile()
// method

// Creating object
object GfG
{

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

        // Creating an Iterator
        val iter = Iterator(7, 3, 4, 6, 7)

        // Applying dropWhile method
        val x = iter.dropWhile(x => {x % 2 != 0})

        // Applying next method
        val result = x.next()

        // Displays output
        println(result)

    }
}

Output:

4