How to handle no command-line arguments in D?

Question

The proper parlance for the main() entry point in D is

void main(char[][] args)
{

}

but how would I know if there aren't any arguments passed, given it's an array?

Answer 1

void main(char[][] args)

In modern D, the canonical signature is void main(string[] args), or void main() if your program doesn't need arguments.

but how would I know if there aren't any arguments passed, given it's an array?

Check the array's .length property. If args.length==1, then no arguments have been passed to the program. (Argument 0 is always the program itself, as in C/C++.)