What is a common use case for a declarative expression in Pega?

A common use case for a declarative expression in Pega is to calculate values based on user interactions. Declarative expressions allow for dynamic calculations that automatically update values in real-time as data changes or when a user makes selections in the interface. This means that as users input data or make choices in a form, the system can respond immediately by recalculating related fields or displaying updated information without requiring a refresh or manual intervention.

For example, if a user selects a different option from a dropdown menu, a declarative expression can be triggered to calculate a total price or adjust other related values accordingly. This enhances user experience by providing immediate feedback and minimizing the need for extra clicks or actions.

In contrast, other options like defining user interface elements, automating task dependencies, or creating complex data structures focus on different functionalities within the Pega platform. User interface elements are typically defined through UI components, task dependencies are managed through process flows, and complex data structures are established through data model designs. These do not inherently embody the dynamic calculation aspect of user interactions, making them less applicable as common use cases for declarative expressions.