Power Apps: User-Defined Functions Go GA

Key insights

• User Defined Functions (UDFs) are now generally available in Power Apps.
  Version 2508.3 removed the preview switch and the new analysis engine now includes UDFs and is enabled by default for new apps.
• Benefits: UDFs cut formula duplication, make apps easier to build and maintain, and help Studio load and save apps faster.
  Use them to centralize logic instead of repeating the same formulas across controls.
• How they work: Define functions in the app formula area (for example in App.Formulas) with parameters.
  They can return values (like a Fahrenheit-to-Celsius converter) or perform actions (like adding a record and sending a notification).
• Behavior: UDFs recalculate automatically when inputs change, just like built-in functions.
  Controls such as labels, sliders, and buttons can call UDFs and show the results or trigger side effects.
• Side effects and actions are supported: a UDF can update collections and call Notify or other actions.
  Wrap action-based logic in blocks so the function can both perform tasks and remain reusable.
• User Defined Types (UDTs) for passing records and tables into and out of UDFs are still in progress and will reach GA later.
  For now, plan to adopt UDFs to improve maintainability and enable them in older apps by turning on the new analysis engine when ready.

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