A decent exercise for learning how to implement a really useful data type.

The problem is that 8kyu's are wildly inconsistent.
I think 8kyu should be 'return a + b' type exercises, they're supposed to be the easiest here.

Sorry, I don't understand spoiler mean before.

Please mark your post as having spoiler content next time

This is too easy. I have done the same type of problems in 8kyu.

Good Kata for repeating Switch-case on Java

I think it's not a 7kyu..

After hitting the "ATTEMPT" button I receive the following error message after successfully completing and "Passing" the first 13,021 Random Tests?

    STDERR
    Max Buffer Size Reached (1.5 MiB)

It appears that the test results output from this kata is exceeding the maximum size of the Codewars output buffer. Is there a reason that you require so many random tests?

Thanks. Helped a lot!

Given two numbers and an arithmetic operator (the name of it, as a string)

Because you receive that info as the third argument of your function. Sorry if that's not what you asked.

How am I s'posed to know either to multiply or divide or any other arithmetic

Scala Translation

That's for Java, right? There is an open issue below.