Iterator నమూనా అంటే ఏమిటి?

ITERATOR → access elements of a collection SEQUENTIALLY without exposing its internals:
  → provides a standard way to traverse (next element, has more?)
  → the collection's internal structure (array, tree, linked list) is HIDDEN
  → decouples traversal logic from the collection
→ "iterate without caring how the collection is structured"

 ( item  collection) {  }   


* () {  ( i = ; i < n; i++)  i; }   
 ( i  ()) .(i);