> How do you manage errors?
It becomes unwieldy like every other language.
> What happens if Questionnaire.xlsx or Sheet1 doesn't exist ?
Runtime exception.
I've seen too much Clojure code (and this goes for every language where error handling is optional - Hi Javascript!) just skip error handling and focus on "happy path".
And as demonised as Java's checked exceptions are, they at least forced error handling to be thought of.
