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Noob question -- On error, exit function and terminate script

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Hi, all,
I've spent a couple of hours now looking for the answer without
success. Is there a simple method to terminate a script upon an error
condition that occurs within a function, E.g.,
function foo(bar)
 if bar == ""
 ???
 end
 ...
end
Appreciate any guidance here.
Best regards,
Paul

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