I'm already able to dynamically update the title. I just want to know how to style the title meaning using CSS to make it look like a tooltip.

But map does not usually takes two arguments values.customMap((val, index) => 2 * val) It also works on single argument. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map So, I want to understand how are you handling this logic in your code :)

That was great but I'm really having a hard time in understanding the part where you did mappedArray.unshift(cb(this[i], i)); . I am not able to understand how it is working and how it is doing the calculation like 2 * val

No, I'm not using any middleware to return the value. It's simple try catch and if else going on inside divideTenByFive() which returns the expected value in production also.

No, I'm not using any middleware to return the value. It's simple try catch and if else going on inside divideTenByFive() which returns the expected value in production also.