It's called a spread operator, you can use it to define "the rest" of arguments, like (a, b, ...rest) and that'll be an array of the additional arguments. You can call this as myFunc(a, b, c, d) and the rest argument will contain [c, d]. I hope this makes sense. :)

Could you explain what is doing ...names?

wot

will it work with a string?

To learn this is strangely satisfying.

Thank you very much.

I had to google it too, heres another great article

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator

Well that's a new one. Hmph. I guess if you already know Reflect.construct then you don't really need the educational value of implementing all of new's behavior in an imperative way…