Use of iterators over array indices

Question

I just wanted to know what is the main advantage of using the iterators over the array indices. I have googled but i am not getting the right answer.

Answer 1

There are many data structures, e.g. hash tables and linked lists cannot be naturally or quickly indexed, but they are indeed traversable. Iterators act as an interface that let you walk on any data structure without knowing the actual implementation of the source.