- maybe->truth maybeprocedure
- either->truth eitherprocedure
If maybe/either is a Just/Right, returns its payload; otherwise returns #f. If the Just/Right does not have exactly one value, a condition of kind (exn type payload) is raised.
If maybe/either is a Just/Right, returns its payload; otherwise returns #f. If the Just/Right does not have exactly one value, a condition of kind (exn type payload) is raised.