!

I didn't know that: thanks for the tip :)

'and' should not be used in logical comparisions, it should be used only in flow logic, for example in ruby on rails controllers you often see something like:

def foo
  if bar
    redirect_to :root and return
  end
  
  # do semething else...
end

yes, using 'and' often gives valid results but it's bad practice because the 'and' operation has lower precedence than '&&' and you asking for strange bugs in code

I agree to that.

Oh, I see. I get it now.

"As no one knows what Santa will give them, gifts can be anything [...]"

It's suppose to have a bit of black box presence around it.

Nice kata. I think you should go without "The kata tests are the same as the sample fixtures.", though.

I was also going to propose this. Test cases over a million and with length multiples of three.

This is a very nice kata. I enjoyed doing it.

I don't think so. If the language provides the functionality, why not use it? It is a clever way to improve your code throughput and a valid way to teach others a valid example.

Wow, nice function programming Kata!