Would you raise this as an ArgumentError, RuntimeError, or other?

I am getting an environment variable in one of my functions, and if that variable is not set or empty then I want to raise an exception because the program can’t function without it. What type of exception would yall raise here?

Here’s the list of default exceptions:


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I agree: RuntimeError, which is a generic base class for application runtime-type errors.

ArgumentError is more for situations where the wrong sort of thing was given to a function, rather than a bad value, but a type not capturable in guard syntax, such that a FunctionClauseError is inappropriate.

In particular, changing the environment variables given when running your program would allow the same function to start working, so there clearly wasn’t a problem with the argument given to it: there was a problem with the runtime it was executing in.