Agreed. For instance, how many possible integers are contained between each period in an IP address? I do not know of the top of my head.

IT looks like there is an issue with this kata that the author needs to fix...

I'm a bit stuck with this bit too, half the _stub method tests are failing: keep getting:
first handler calls - Expected: 1, instead got: undefined

But the arguments and the call seem to make it through on the other half of the tests:
Test Passed: Value == [1,2,3,"first",null,false]

It works fine.

You misspelled "Hello".

Expected: Hello World!, instead got: Helo World!

Couldn't pass the test. What does it mean?

Regular expressions and a little bit of wizardry to get what was entered :)

So it's not just what you return - it's using any Strings full stop in the script. If that helps...

Any hint ? I'm stuck, I always got Error: Strings are not allowed. even if I return a number

Yes because it's based on the bill, not on the money value

Good kata to practise regex !

Very good kata !

Same as me, did you found some resource about printing exponential numbers ?

Nice kata ! But I think it's less clear for people who never worked with IP address (at least, doing basic calculations)