This is software engineering question Iterator - Description - how it works - Under what circumstances is this pattern ideal to apply? - In what situations is this pattern not suitable for the application?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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This is software engineering question

Iterator
- Description - how it works
- Under what circumstances is this pattern ideal to apply?
- In what situations is this pattern not suitable for the application?
- What are the side effects/disadvantages of this pattern
- Apply to the actual program. Compare the situation before and after the pattern is applied

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