Thanks, I got it because I did it by hand and got different results than using charCodeAt() and didn't understand because I just kept thinking "what is the difference, every letter is just +96" but when you break it down I understand the math better

God please! Thank you!

Thank you! That was reallly helpful!

Please don't spoil solutions, thanks. Take a pencil and a paper and check for this, it's pure logic.

If you want to solve this problem with the least code, you must first find out the law, and then this problem is more like a mathematical problem

A problem with your code is not an ISSUE with the kata!
And yeah your code should handle random input shouldn't it? Maybe copy the input it fails for and debug it?

There should show you a "Test Results" after clicking on "Attempt" .

Try to click the red "should_handle_invalid_ones" and click "Log" following.

Can you see "Expected" and "Actual"?

I don't know if it's useful for you.