Strukturierte Fehlerbehandlung mit Result
In this exercise we're revisiting the expression evaluator exercise that we did in day 2. Our initial solution ignores a possible error case: Dividing by zero! Rewrite eval
to instead use idiomatic error handling to handle this error case and return an error when it occurs. We provide a simple DivideByZeroError
type to use as the error type for eval
.
- The starting code here isn't exactly the same as the previous exercise's solution: We've added in an explicit panic to show students where the error case is. Point this out if students get confused.