Same. The author did not fix it. 7 years passed.

"Take 2 strings s1 and s2 including only letters from a to z."

People often use them where they shouldn't, unless it's a callback.
But this is more my preference

It is strange to hate arrow functions... It is just type of function

I hate arrow functions, that's why I wrote it as supposed to!!!

"Take 2 strings s1 and s2 including only letters from a to z." It's defined in the instructions, so the tests are complete.

"but still this solution seems to be correct, because task guarantees that only letters will be passed in. solution does not have to check for non-letters."

That is fair I suppose.

• solution has to be correct to be posted here.
• any solution is just as correct as far the tests go. If tests are poor, invalid solutions can slip through.
• but still this solution seems to be correct, because task guarantees that only letters will be passed in. solution does not have to check for non-letters.

I thought a solution had to be correct to be posted here?

This is incorrect. It does not test for non-leters.

But...why? lol

This looks a little bit like the problem I was having. If you're doing player1.zip(player2), you need to check whether player2 is longer, and if so, do player2.zip(player1).map(&:reverse), because otherwise the extra elements in player2 won't get zipped.

(Ruby) When the weights are the same ie: "30KG", "30000G", "30KG" only the order that starts with KG is accepted: "30KG", "30KG", "30000G".
Also "90000G", "90KG" is not acceptable, but "90KG", "90000G" is.