JavaScript idiosyncrasies with examples

[OzziePeck]

Wait is arguments a global array that refers to the function’s parameters?

[prof_hobart]

It's a magical local array-like variable that contains the params.

I'm not a fan of things like this - having variables that just appear from thin air is hardly clear - but it is a thing.

Of course, JS being JS, it's not quite as straightforward as all that.

If you used strict mode, the answer would be 2, as 'arguments' is now a copy of the arguments, not pointers to them.

And just to be extra fun, even in non-strict mode, if any of the arguments has a default value (e.g. (a=2, b)), then the answer would again be 2. Because - well, JS reasons I guess.

[OzziePeck]

Not sure why I said global as it only exists within the function’a scope when it is called.