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The Definitive Guide to Power Query (M)

You're reading from   The Definitive Guide to Power Query (M) Mastering complex data transformation with Power Query

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Product type Paperback
Published in Mar 2024
Publisher Packt
ISBN-13 9781835089729
Length 758 pages
Edition 1st Edition
Languages
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Authors (3):
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Greg Deckler Greg Deckler
Author Profile Icon Greg Deckler
Greg Deckler
Melissa de Korte Melissa de Korte
Author Profile Icon Melissa de Korte
Melissa de Korte
Rick de Groot Rick de Groot
Author Profile Icon Rick de Groot
Rick de Groot
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Toc

Table of Contents (19) Chapters Close

Preface 1. Introducing M FREE CHAPTER 2. Working with Power Query/M 3. Accessing and Combining Data 4. Understanding Values and Expressions 5. Understanding Data Types 6. Structured Values 7. Conceptualizing M 8. Working with Nested Structures 9. Parameters and Custom Functions 10. Dealing with Dates, Times, and Durations 11. Comparers, Replacers, Combiners, and Splitters 12. Handling Errors and Debugging 13. Iteration and Recursion 14. Troublesome Data Patterns 15. Optimizing Performance 16. Enabling Extensions 17. Other Books You May Enjoy
18. Index

Strategies for debugging

Debugging is an integral part of the development process, and encountering situations where the code behaves unexpectedly is inevitable. Effective debugging strategies play a crucial role in identifying and rectifying errors while also enhancing code comprehension. General best practices for debugging M code include the use of comments, renaming steps for readability, breaking down complex expressions, and testing.

Let’s look at them in greater detail:

  • Comments are not just placeholders for thoughts or code descriptions; they serve as critical pointers that guide the debugging process. They can help you and others understand the purpose and functionality of different code sections, making it easier to locate and fix issues. Moreover, comments can be used to mark areas of code that require further review or are prone to errors.
  • By default, Power Query assigns generic names to each step. These names don’t provide much insight...
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