Idiomatic way to test if no positional params are given?

Question

What is the most idiomatic way in Bash to test if no positional parameters are given? There are so many ways to check this, I wonder if there is one preferred way.

S

Answer 1

If you want it to be an error to have no positional parameters:

: ${@?no positional parameters}

will print "no positional parameters" to standard error (and exit a non-interactive shell) if $@ is unset.

Otherwise, I'm not aware of any better options than one of the various methods of checking if $# is 0.