The length() method belongs to the concrete value members of the class AbstractIterator. It is defined in the class Iterator. It is also identical to the method size, it is also utilized to find the length of the stated collection.
Method Definition : final def length: Int
Return Type :It returns the length of the stated collection.
Here, the stated iterator is non-empty so, the length of the given collection is returned.
Here, the stated iterator is empty so, the length of the given collection is zero.