Isn't eval a dangerous method? You can easily execute any line of code using it, including malicious

Rounding doesn't work. (Even when it seems to work.)

It isn't. Rather, it's a incorrectly upvoted not-so-good practice.

Why is floor function a better practice than div function?

The Ruby Tester Code is at fault or the directions are wrong, I had to make sure that multiple spaces got replaced by a single space in the ID. This doesn't appear to be the directions. Other solutions did the same, I course corrected based on the failed tests.

You should never put any information which might give away the kata solution in the comments (without checking the "mark as having spoiler content" box) as they're visible to every one.

Range has a #sum method, which will cover the 0 case on its own: (1..num).sum works perfectly

One for @nbeck

:D

Hahah this was a hilarious Kata! Thank you!

No matter how many Hairs the Random Test cases have, the tests expect the code to return clean in Ruby. All random test cases in Ruby are expecting "Clean!".

Read the article in Launch School "refernces-and-mutability-in-ruby"

It works, my solution was just a simple Math::PI equation.

For me the example was fine when i tried it. i will check again