My code returns [ "Tablets", "Music CDs", "Speakers" ]

It doesn't, have you read the error message?

"Speakers" goes before "Keyboards"

expected [..., "Keyboards"] to deeply equal [..., "Speakers"]

And what's the question? Your logic is correct, the only thing that's left is to make your code correct too.

Use console.log(peopleInLine); to print the input.