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Node.js Design Patterns

You're reading from   Node.js Design Patterns Design and implement production-grade Node.js applications using proven patterns and techniques

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Product type Paperback
Published in Jul 2020
Publisher Packt
ISBN-13 9781839214110
Length 664 pages
Edition 3rd Edition
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Authors (2):
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Luciano Mammino Luciano Mammino
Author Profile Icon Luciano Mammino
Luciano Mammino
Mario Casciaro Mario Casciaro
Author Profile Icon Mario Casciaro
Mario Casciaro
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Table of Contents (16) Chapters Close

Preface 1. The Node.js Platform 2. The Module System FREE CHAPTER 3. Callbacks and Events 4. Asynchronous Control Flow Patterns with Callbacks 5. Asynchronous Control Flow Patterns with Promises and Async/Await 6. Coding with Streams 7. Creational Design Patterns 8. Structural Design Patterns 9. Behavioral Design Patterns 10. Universal JavaScript for Web Applications 11. Advanced Recipes 12. Scalability and Architectural Patterns 13. Messaging and Integration Patterns 14. Other Books You May Enjoy
15. Index

Iterator

The Iterator pattern is a fundamental pattern and it's so important and commonly used that it's usually built into the programming language itself. All major programming languages implement the pattern in one way or another, including, of course, JavaScript (starting from the ECMAScript2015 specification).

The Iterator pattern defines a common interface or protocol for iterating the elements of a container, such as an array or a tree data structure. Usually, the algorithm for iterating over the elements of a container is different depending on the actual structure of the data. Think about iterating over an array versus traversing a tree: in the first situation, we need just a simple loop; in the second, a more complex tree traversal algorithm is required (nodejsdp.link/tree-traversal). With the Iterator pattern, we hide the details about the algorithm being used or the structure of the data and provide a common interface for iterating over any type of container...

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