Creating custom functions

With proper planning and an understanding of parameters, you’re now ready to dive into creating custom functions in Power Query. This section will guide you through the process of building your custom function, including defining its structure, working with M code, and testing your function.

Defining the function structure

The structure of your custom function is crucial for its functionality and usability. Define the following aspects of your function:

• Name: Choose a descriptive name for your function
• Parameters: Specify the parameters your function will accept and their data types
• Description: Provide a clear and concise description of what your function does
• Result: Determine the expected result or output of your function

Writing M code

Power Query functions are created using the M language, which we touched upon earlier in this book. You’ll need to write M code to define your function’s behavior...