I like that kata as it is a use case that sounds very likely in web development.

I have a noob question for production. I really like the template approach because it makes the structure of the possible variants so clear.

Would it make sense to make templates a constant and then make a copy of the appropriate entry that will then be modyfied?

OMG, I did so much work for such a simple formula! 🙈 If only I had know before digging out pen, paper and very dusted math skills. 🤷

Good kata for highlighting that some situations require problem solving skills rather than plain coding skills.

Wow, as an absolute beginner I take away a couple of things from this solution:

• The description of a problem may make you blind for alternative solutions
• If the only tool you have is a hammer everything looks like a nail (yea, this sounds corny, but this is how I feel)
• Math helps you find alternative solutions and writing more efficient code
• Javascript has some really cool features (had to google to figure out that this code uses spread syntax ...)
• It takes some skill and understanding to appreciate a solution

Thanks for this lesson! :-)