I am jealous

wow nice brain

oh,It's great!

clean!

ahahahaha

What about NaN?

Very simple.

Hah awesome :D

thanks that was throwing me off i thought i had to code for that. Either way it was fairly simple but I enjoyed the kata. Thanks.

how does this handle division by 0? Does it return NaN by default?

Nice little test. One bit was a little confusing.

0 means the proposed digit is correct
1 means the proposed digit is lower than the correct one
-1 means the proposed digit is higher than the correct one

Took me a few minutes and a number of attempts before I figured out I was reading it wrong. You migh be able to write a bit more clearly perhaps.

But I enjoyed doing this one. Well done!

I absolutely agree with this. I think this would make for much more interesting algorithms, and a more realworld type scenario.

I think this may sneak a 3kyu. Testing rows for validity is easy, columns a bit more complex, but the 3x3 blocks require some careful management of the data. If not 3kyu, then a solid 4kyu.
This was enjoyable!

Do you want to specify behaviour for strings with length < 5? Or specify that strings have at least 5 digits?