Why is this rated so highly? This solution modifies input to then return a result, which is awful.

same :)

What he is saying is that the function is mutating the original signature array.
You should make a copy of the signature array. You can do that with const aryintSignature_Copy = [...signature];

Wow, such a clever sollution!
I was breaking my head on excluding those 'edge cases' (n =< signature.length) from the loop.

What would be a good practice to eliminate overcomplification?
Is it to write all possible inputs and outputs in 1 overview to spot the most efficient pattern?

But thnx, this was a great lesson.

Use spoiler flag next time please.

for sake of learning, why is using slice not a good practice?

for sake of learning, why is this the worst solution?

beutifull
i was doing mind gymnastics but this is just wow

Dayum.

Nice

This solution looks amazing
Genius!!!

great solution

This is a great solution! I learned a lot from everyones commentary and by looking at your solution. I learned that you can grab the other two values from the array by doing i+1 and i+2 and after you add all 3 values that new value gets added as the 4th element and then on your second iteration i is going to be the second value and then you add those three values together and it becomes the 5th element. After your completely done with the array, you can create a new copy of the array with the slice method.