It already works. If it doesn't work, there's a problem with your code. You need to make a function that returns a function.

Test.describe("Basic tests")
Test.assert_equals(function_factory(2,3,'+')(), 5)
Test.assert_equals(function_factory(1,1,'-')(), 0)
Test.assert_equals(function_factory(2,2,'*')(), 4)
Test.assert_equals(function_factory(24,4,'/')(), 6)
Test.assert_equals(function_factory(14,4,'%')(), 2)

changing to this seems to work :)

change to Test.describe("Basic tests")
Test.assert_equals(function_factory(2,3,'+'), 5)
Test.assert_equals(function_factory(1,1,'-'), 0)
Test.assert_equals(function_factory(2,2,'*'), 4)
Test.assert_equals(function_factory(24,4,'/'), 6)
Test.assert_equals(function_factory(14,4,'%'), 2)

The outputs in some fixed tests overflow 2**53 - 1.

Duplicate.

I have tried so many ways to make this code work and I guess I didn't understand te aim of it. If I test on IDLE the code that I managed to write the returns match, but everytime I run the sample tests it says «TypeError: 'int' object is not callable». Can anyone give me a light of what I may be doing wrong?

I think it is a function, more than a method, plus eval is evil, but AFAIK you can certainly use it in Ruby: what error do you get?

Hello, Giacomo! Tnx for your translations! One question, why I can't use eval method in my solution? Nothing in description. Thanks for your answer.

(resolved)

Not before breakfast! ;)
Now done!

Shouldn't you approve them, then :D?

Technically "Mississippi" is such a case but you are right.

Nice 👍

Which is an issue.

Duplicate of https://www.codewars.com/kata/number-of-permutations-without-repetitions

Python, Ruby and Crystal translations for you to approve, cheers :)