Power Apps named formulas allow for the same app logic to be used in multiple places, ensuring the most current value is always available and up-to-date. They are useful for pre-filtering SharePoint lists, gathering extended user profile data, checking security roles for the current user, obtaining URL parameters and setting default values, making simpler references to environment variables, and configuring app theming values. By using named formulas, app developers can simplify their code and manage definitions in one central location.
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