First thing with new language
I do a couple of things when investigating a new language. First, I look at the package handling. Can it handle more than one file, easily. This is critical for software development. Building libraries and creating a project for your application. Next, how does the language look in an editor. Do I need something special. Lisp is fine in Emacs. But you should never open lisp code in another editor and then expect not to hate the language.