In a purchase order application, why would you choose to use a declare expression rather than a data transform to update an order total?

Using a declare expression to update an order total in a purchase order application is advantageous primarily because the system automatically monitors input properties. This feature means that anytime the monitored properties change, the declare expression will automatically recalculate the order total without additional manual intervention.

This automatic monitoring ensures that the total is always accurate in real-time, improving consistency and reliability in the application. It also reduces the likelihood of errors since the developer does not have to remember to recalculate the total at every relevant point of data entry or update.

In contrast, data transforms require explicit calls to perform updates. This means the developer must manage recalculations manually, which can lead to oversight and errors, especially in complex scenarios where multiple inputs might change simultaneously.

The emphasis on automatic updates provided by a declare expression improves the overall efficiency of the order processing workflow, allowing for dynamic responses to user inputs.