Using custom functions in Power Query - Power Query ...
learn.microsoft.com › en-us › power-queryDec 17, 2022 · A Power Query custom function is a mapping from a set of input values to a single output value, and is created from native M functions and operators. While you can manually create your own Power Query custom function using code as shown in Understanding Power Query M functions , the Power Query user interface offers you features to speed up, simplify, and enhance the process of creating and managing a custom function.