Prolog translation

Done in latest fork

Approved

python new test framework is required. updated in this fork

Ruby 3.0 should be enabled (Refer this & this for more detail)

Python new test framework should be used (Refer this & this for more detail)

Not anymore, but it was due to your code mutating the input. Read this: https://docs.codewars.com/training/troubleshooting#works-but-no

Problems with random test. When try it manualy all works. Maybe some sort of mistake

You were modifying your input weren't you?

All random tests(JS) show: Expected 1. Which cannot be considered as right answer with given arrays.
Maybe this is broken?

And as Jake just approved the Ruby translation, who am I to pass on the chance to make a Crystal one? Because I do also statically typed now, ah!

Fixed, thanks for the feed :)

Python 3.4.3, examples run fine, but when getting to the random tests, I get "NameError: name 'collatz' is not defined". I make no reference to an object of that name in my code.

Oh, sorry. Yeah, sure.

Can we close the issue now, then :)?