Sometimes it's not entirely clear. Maybe draw a primitive view layout

"Should return null for invalid arguments" The last check yields a number, but should return null. I used the isNaN method, but it doesn't work. Are you using standard primitive data in your test?

Nice Kata!

Stupid task: a vague theory that is misleading

this task does not correspond to the seventh level of difficulty

There are no incoming arguments. How to write a function?

This is nice Kata! :=)

I'm tired of solving this Kata, but this Kata is very good! ;)

very..very good, guys!

I understand what you want to tell me

This is good a task!

i would delete this Kata :(

Cycle While - it's so easy! ;)

i don't like this Kata