If you mean the sample tests, you need to write your own, otherwise, click Attempt directly.

I looked at the solution and when I copied and pasted this-it didn't work for me.

I have no idea why not.

So Javascript just wants to join in on the OOP club?

As far as i know, because this one is still considered as an object, where you can directly write function rather than declaring 'class' first, it is also known as Constructor Function.

I'm not disagreeing with you because I'm still learning JS, but as a programmer that seems wrong to me. Since you can't confirm what type the input will be, wouldn't it be best to check against undefined rather than your method? I mean again, it's clever - but would you really want to use it in production? Is it faster to make sure the input isn't falsy, AND use the code above?

Very clever, but is this a best practice? It's not immediately clear what's going on, whereas the other solutions are.

it is not a good idea to make func its own context. Better this, so the function context can be set by calling spread in whatever context you choose.

I'm sure you are all right. JS is very confusing at times. A function can not hold a variabel that 'this' can access right? An object (called through the this keyword) can access it's properties via dot-, or bracket notation. Then what's the point of using a function as the object as you have no use for the 'this'?