var cities = ["NY", "SF"]; cities.length = 1; console.log(cities); // outputs ["NY"]or
var a = 1 + 1 + "1"; // equals "21" var b = "1" + 1 + 1; // equals "111"It's as if they are trying to say to you "Look at that piece of crap language you are programming in! You must be an idiot!" while at the same time offering you a job in said language whilst wanting to build up their systems in it.
Instead, ask them to do FizzBuzz at a console with a text editor and a browser (whilst looking over their shoulder to see that they are not cheating) and really look at how well their code is written. Ask them to generate a recursive function. Ask them to create an instance of an object and add some functionality to it via prototype.
In short, ask them to do something they do in real life and what you probably want them to do for you.
Don't remind them how shitty JS is, believe me, they know this more than you.