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

I prefer using the fact that if there are no positional parameters, there is also no first parameter:

[[ -z $1 ]]
test -z "$1"
[ -z "$1" ]

It's just a tiny bit lighter on the reader. Of course it only works when the assumption that the first parameter can't be an empty string is true.