It would be very useful to be able to save expressions (either at a page level or global app level) and easily reuse them in one of the two ways:
- Use the saved expression (i.e. if the saved expression is modified, each place referencing it is affected)
- Copy/paste saved expression
Point 1 is the most useful option for complex calculations that need to be done in various places. For instance, there might be an expression called “Calculate total order price” which is reused in various parts of the user journey. If it is a long and complex expression its easy to forget to keep updating it in many places as it changes, which is a problem that would be solved by Reusable Expressions.