The quirks of JavaScript

As someone who has only had a cursory learning of JavaScript, I predicted correctly. The concept of overriding is known to me, although it's clearly in a slightly different context here and that 010 is 8 in octal I knew since I learned C.

I gather that JavaScript has a lot of quirks (eg: '==' vs '===' if I'm not mistaken) but I don't feel like these are too.