Power Apps user defined functions allow you to write a formula once and reuse it throughout an app. To create a user defined function, you choose a function name, determine the inputs and their data types, and write a formula to evaluate. You can then call the function from anywhere in the app. This feature is an extension of the Power Apps named formulas feature. User defined functions are currently an experimental feature and must be enabled in the app settings. There are some limitations to user defined functions, such as all parameters being required and certain data types not being supported. Error handling is also important when using user defined functions.
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