the array it's the sequence of last digit in fibonacci's numbers. Every 60 numbers the sequence start over

I think this is an excellent way to teach ternary operators. I've used them quite a bit but never like this, and I feel like I understand it better now.

I fixed the warnings on submission, but given this kata is 8kyu, I think the passing state is reasonable. Having the author solution length shown is also nice to shoot for.

please see my comment above

Ruby:

• the size limit seems very lax: you can fit a full-blown case statement in your solution, and could even include indentation... you can easily go below 100 chars (or even 90)
• it gives a bunch of errors when submitting, but it still works:

STDERR
main.rb:21: warning: already initialized constant SOLUTION_LENGTH
main.rb:17: warning: previous definition of SOLUTION_LENGTH was here
main.rb:21: warning: already initialized constant SOLUTION_LENGTH
main.rb:21: warning: previous definition of SOLUTION_LENGTH was here
etc.

This is the best level 8 kata in the history of codewars.

That's a suggestion, not an issue.

8 kyu kata represent a beginner level. At this level the kata is only challenging for users new to programming. This includes programming tasks such as:

Defining a simple function (i.e. hello world)
Basic variable assignments
Fixing basic syntax issues
Trivial algorithms such as basic if/else statements

Not an issue.

Not an issue.

Not an issue.

I think that this kata should be made more difficult. I would pass in an additional parameter that would change the price of the pizza from 200 to something more or less. The new parameter being passed in could represent either a discount or extra toppings that cost more. It could be an integer, or it could be a double that represents a percentage.

This would be a good beginning example of using the Arrays.stream() functionality. This is just a suggestion, but you might want to suggest this in the description and provide a link where the reader can learn about the Java 8 stream functionality. For example, https://www.mkyong.com/java8/java-how-to-convert-array-to-stream/ or https://www.geeksforgeeks.org/streams-arrays-java-8/