iterator

the iterator returns the next element in the sequence.

this iterator traverses the list in insertion order.

initialize the iterator before entering the loop.

reset the iterator to the start of the collection.

the iterator points to the current item.

advance the iterator after processing each record.

check whether the iterator has reached the end.

using an iterator avoids copying the entire array.

the iterator supports filtering items lazily.

if the collection changes, the iterator may become invalid.

this iterator throws an error when no elements remain.

store the iterator in a variable for reuse.