Changed it to include 2 left movement, not 1.

which you came up with, remember? Good point about the example.

I've got plenty of ideas that are not duplicates. However, if you can't solve most of my BF katas, I think you are gonna need to think for a bit on those. Stay tuned.

We don't have to worry about state, the star is used correctly here, if I understand what your concern is

Finally a YurichBRO kata that even I can solve :-) Thanks for the fun.

I hope you can indeed create more installments in this series without duplication of existing kata. I would look forward to that.

I was only talking about the use of * used here:

It does this based on the current rule*, and the bit at the current position

not about any of the actual language.

The example only handles moving to the right and is a little confusing, I would consider showing at least one move to the left that affects the output.

Good white kata!

It was supposed to be "state", not "rule". Changed to state. Given that the 3 things listed are clearly not states, this is not confusing anymore.

the last thing sounds better, changed to that.

Different rules.

Turing machines have multiples states, all of which can have different rules that are a combination of the three rules as in this kata.

Maybe call them "state rule sets"?

I find it educational to know that there are three rules, so I'm fine with being instructed to only follow one of them.

... it just needs a different syntax for clarity's sake.

there's effectively one rule. so do we need to worry about rules, or not? I honestly don't have an answer.

this key makes sense given the intended use for the '*' char:

* = we don't worry about these in this kata

however, there is the just previous sentence that does have a '*' char in it:

It does this based on the current rule*, and the bit at the current position

which is slightly misleading if the rule is something we need to worry about

return a string of 1s and 0s at the position of the head on each step

You could make that

"return a string of 1s and 0s at the position of the head at the beginning of each step"

better. the word "atomically" comes to mind ( any future plans for multiple read heads on a single tape? ), but you don't have to use that.

( some ) people tend to stop reading when the examples start, so the current ordering eems less than ideal. but that's a different issue.