Iteration is a process used in objects to step though the member list of the component you require. It does not usually involve visible indexes since the purpose of an iterator is to maintain a pointer to the last used item, then when called it moves on to the next object.
Using any appropriate looping code process is the standard method for reviewing those iterated objects, as long as that process detects the end of list indicator (usually undef) to break out of the loop.
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