Hi Ritz-w, enjoyed the Kata. Just a quick change to make -- you've pre-loaded a function to the user's window that's called calendarConversion rather than nengoConversion, as is required for the tests to work. I learned something about Japanese dating, thanks!

More complete coverage of possible ( and impossible ) inputs in the random tests would have better chances of uncovering possible bugs in solutions.

For this kata, this is enough though.

Thank you again for the feedback. I've put in a few random tests now. As you must be able to tell I'm totally new at this, and appreciate all the advice I can get. If you might be willing to give me more pointers, what else do you think might help me to optimise this? Cheers

It's solveable now. Now you desperately need random tests. ( Before this gets retired because of abysmal ratings. The idea is nice enough, but the implementation is killing you. )

Thank you for the feedback. I believe I've fixed the tests. Would you like to try again?

This kata is unsolvable. Tests are broken.

Tests also expect different results than specified.