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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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Toc

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

Exercises

  • 4.1 File concatenation: Write the implementation of concatFiles(), a callback-style function that takes two or more paths to text files in the filesystem and a destination file:
    function concatFiles (srcFile1, srcFile2, srcFile3, ... ,
                          dest, cb) {
      // ...
    }
    

    This function must copy the contents of every source file into the destination file, respecting the order of the files, as provided by the arguments list. For instance, given two files, if the first file contains foo and the second file contains bar, the function should write foobar (and not barfoo) in the destination file. Note that the preceding example signature is not valid JavaScript syntax: you need to find a different way to handle an arbitrary number of arguments. For instance, you could use the rest parameters syntax (nodejsdp.link/rest-parameters).

  • 4.2 List files recursively: Write listNestedFiles(), a callback-style function that takes, as the input...
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