I tried to create a function that will change the background-color of all class-list items whenever a span of the specified className is hovered over.

My problem is as follow, and is more about maths than programming I think. JavaScript is used here.
I have 3 arrays, let’s say :

I am trying to get data from a list and yet is giving an error

I am trying to solve this Codewars question (https://www.codewars.com/kata/54da539698b8a2ad76000228/train/javascript) but something doesn’t work. I don’t know what’s wrong with my approach.Here is my code:

When I try to create an Array in Javascript I get a mistake on a console log that says: Uncaught SyntaxError: Unexpected token ‘[‘ . Any idea what to do about it?I have included an image of the error

i need help for this script.

I need to remove all buttons except the one which was clicked (perhaps using e.target.id?) – according to its index (using for loop.

I tried to create a for loop which loops through all buttons in an array I made – and it’s supposed to work according to: (https://www.w3schools.com/js/js_loop_for.asp)

I am looking to mock up a structure up like this:

I have an original array deptWiseAlerts, I am trying to bring out an output array graphData3 as below