Getting TypeError: results.forEach is not a function

Hi Cory,
First of all I would like to thank you very much for your wonderful course.
Although it's not suite for my developing level, it is very fruitful and it push me up the developing scale, hopefully one day to become an expert like you.

Now I am having the same issue of "TypeError: result.forEach is not a function..",
and I do not understand what should I set result to ? and how to solve this issue.
Very appreciate your assistant.

Meanwhile I solved it using regular for loop, but i would like to understand why it's not working as it should.
Thanks
Yigal

No file, test, or entry point is named, and the issue provides no code showing the value of results. Start by locating the course example where results.forEach is called and inspect the value returned there; the issue is done only when the cause of the TypeError and the expected collection value are documented or corrected.

Written by the indexing model from the issue text.