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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
They don't. All the tests follow the same pattern.
There is no issue with the random tests in JavaScript.
No idea either, I've tried your current solution changing all arrow functions to normal function syntax and it worked fine.
That's the point of the kata, you need to reimplement the three mentioned, but you can't use any of the other Math methods either because they're gone.
Keep in mind that empty arrays may be not displayed in output, so you might be looking at another tests's inputs, hence different expected results.
There is no problem in the tests but your code is wrong.
Before posting issues it is good to have a look at the top of the page to see how many guys passed the kata (11596 in JS which I suppose... is your language). If the number is high enough chances are that your code is wrong.