Totally agree with your comment.
Const is better in current situation.

Why let instead of const?

simple and short

Test.assertEquals should be used instead.

nevermind, I found the isssue. I was using a different Node version.

Can anyone tell me why I'm getting an error in this code here. I seem to do everything that was correct and I'm getting an error for some reason.

Seems to be fine now. Thank you!

Ah thanks for the info. It should work now. Please reply if you have any problems, thanks

Something wrong with random tests: I'm receiving this error:

Test Passed
Test Passed
Test Passed
Test Passed
Test Passed
TypeError: Object function Array() { [native code] } has no method 'fill'
           

This reason must be in the node version: I have 'Node v0.10.33/Babel' specified for this kata.

Hm, your quotes don't look quite right to me. Html, by convention, tends to use double quotes - and so this Kata makes that assumption. But single quotes are valid (as are no quotes!).

Perhaps post the output as a solution - maybe we can help you