The following example shows a typical use of an iterator.

Another meaning of range in computer science is an alternative to iterator.

By using an iterator one is isolated from these sorts of consequences.

Additionally, a descending iterator over the items in the set is provided.

Using the iterator, the find function searches for an element with the given key.

A sequence has an method that returns an iterator object.

However they still require explicit iterator objects as their initial input.

New iterator methods can be defined using the and statements:

The way the Iterator classes are implemented opens up various means for scalability.

All collections have an iterator that goes through all of the elements in the collection.

Additionally, both a forwards and a backwards iterator can be generated.

Python hides essentially all of the details using the iterator protocol.

Remote query agents service each subtask and return results to the iterator.

An iterator can access both the key and the mapped value of an element:

The iterator would then access each element, executing its method with the parameter.

And if you want to print the message 90 times and show the iterator:

In short, a generator looks like a function but behaves like an iterator.

This is an implementation of the Iterator pattern.

In object-oriented languages an iterator, even if implicit, is often used as the means of traversal.

It is possible to specify more than one iterator variable, in which case they are assigned sequential values from the list.

The example below demonstrates an iterator using .

The property here is parametric in the Iterator .

There is also a statement, in which control is unconditionally returned to the caller of the iterator.

A for-each loop is essentially equivalent to an iterator.

Functions for traversal and retrieval are put into the abstract Iterator interface.