nil. Pass-through when
the assign already has a value.
Handy after a best-effort lookup where you want to keep going with a
sensible default rather than halting or branching.
Configuration
- Assign — the assign to default.
- Default source — where the fallback value comes from. Standard Flow Compose vocabulary: Assign, Extract, Dated property, Literal.
Tips
- For a fail-fast pattern instead, use Flow Guard with Bail when: Not set.