Dart Chapter 9 of 15

Error Handling

Deal with things going wrong: catch exceptions with try and catch, clean up with finally, and define your own exception types.

Files go missing, networks drop and users type nonsense. A program that handles these situations keeps running and tells the user what happened. One that does not simply crashes.

Lessons in this chapter

1. Exception Handling in Dart: try, catch, on and finallyLearn exception handling in Dart: throw, try, catch, on, finally and rethrow, the difference between Exception and Error, and best practices.
2. Custom Exceptions in DartCreate your own exception classes in Dart by implementing Exception. Add fields, build exception hierarchies and handle them with on.