Template literals FTW

You are very correct!
The current implmentation did not account for when number is equal 0

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?

I like it

I would rename p as "total" and n as "current" or something like that for readability.

Try to use a whitespace, it's easy!

guy, you are Einstein

indeed, if you call makeNegative(0) it will be -0 :)

Very very nice solution !

Why is this the best practice?