This doesn't handle null check . what is str is null ? your code throws NullPointerException

This doesn't handle null check .
what is str is null ? your code throws NullPointerException

Yet, this mutation is quite harmless for it adds an additional element and it doesn't actually modify any existing data. In that specific case, I would assume that adding data is actualy the requirement rather than not.

Shouldn't that technically be wrong bc if "yourPoints" are equal to the average it should be flagged as false (Kata description says only true if "yourPoints" are higher).

did you read the kata description?

Awesome solution!

This is what I attempted

thanks!

corrected

(Cough):
In Java, random tests don't compare a user's solution with an expected solution:

  result = LunarCalculator.add(num, num2);
  assertEquals(result, LunarCalculator.add(num2, num));

you are absolutely correct, using a pattern as static variable is about 3-4 times faster.

Correct me if I'm wrong but isn't this solution kind of inneficient in terms of performance in a high concurrency scenario??
The thing is that everytime you invoke String.matches it has to compile the regex before evaluating the String. If you compile
the regular expression in advance using an static variable with Pattern.compile() it will perform way better than this solution.
Isn't it?

Regards.