Joe Armstrong on error handling
November 3, 2020
1 min read
Notes from his
GOTO 2018 talk.
What is an error?
A deviation of the program.
Who finds the error?
What should the runtime do?
Example runtime errors: arithmetic, system, null pointer.
Crash immediately and assume somebody else will fix the problem.
It's basically like rebooting the system.
What should the programmer do?
Log it to a stable storage and crash immediately.
Crashing will result end of losing everything for single threaded languages. Talks about concurrent programming.
Where do errors come from?
Silent errors, doesn't cause program to crash but produces wrong result.
Programmers may not know how to solve because they don't know there will be an error.