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. :)

Thank you.

Lack of test cases.

It's a nice one, just didn't really understand the purpose of "code quick, as fast as you can."

Main fn doesn't have any argument like (arr) or (n).

Why should the coder have to copy paste the houses from the description to solve the Kata?

Missing tests.

More information would be nice, like some tests, which provide something about how data will be passed.