this kata predates the introduction of classes to JavaScript. Nowadays, it would be more idiomatic to use a class.

Your code is almost right now (at least it does not timeout). One problem is the output is a 1-dimensional array whilst yours is a 2-dimensional one.

Math is your best friend, it is explained in your comments, you just have to convert them into valid code !! ^^

Also, read this

I found the table name misleading too

You miss semicolons?

@marcosantoniodev template literals use backticks, not single quotes.

Template literals do work for me

Maybe you're pressing 'test' button, and those tests are missing for this kata, you should just 'submit'

Just submitted a working solution with template literals; the issue is not with the kata.

Table Description for customers:

It's customers

You will need a O(log n) solution or better to pass. (A constant time solution is possible.)

Linear is worse then that.