It can be used for injection attacks

:o

Somewhat true, but to add to that... the 0 acts as a starting number, ensuring reduce behaves consistently. It prevents unintended type coercion and avoids errors when used on an empty array. So, while the 0 is optional if you are 100% sure the array is non-empty and contains only numbers, in all other cases, it's a good practice to include it.

Mad late, but hopefully helpful to future users: 0 is the initial value in the .reduce() method. As imaNami above said - it's totally optional and the code will still work without it.

wow, this is so clean code!
I'm from Indonesian

Thanks for the solution. I get to know about the reduce() function for the first time from your code.

I also thought of using a switch, but as you can see by the comments here, using switch(true) and then doing evaluations in each case is kind of an anti-pattern that can be hard to read and debug.
I would avoid and look for one of the other conditional options in this board.

Your points are not included in the array of your class's points. Do not forget them when calculating the average score!

You didn't take into account the length of your points

why?

lol, wont to start braind xD

My brain exploded when I saw how easy your solution looked lol