It make look like an Array, hell, it even has a length attribute; however, it may not actually be an Array. JavaScript is sometimes a quirky language to say the least and the notion of what is an Array is no exception.
So what are these array-like objects that I speak of? Well there are a few of them, one of which is arguments. arguments is a special variable that is available inside the body of every function. It is in fact, the list of arguments that were passed in.