i get stuck around 2 days Did u solve this kata ?

Not sure what you're talking about. The tests are working fine.

Very probably not a kata issue. Closing.

You're right, fixed it. Thanks.

'Tom Marvolo Riddle' and 'I am Lord Voldemort' are not palindromes because the final letter in the first, 'e', is not the same as the first letter for the second, 'I'. They are anagrams of each other.

(I accidentally upvoted and then downvoted your previous answer thinking it was going to bring me to a seperate level.)

Deleted because I updated the previous answer.

I bring my apologies, you point out "'Tom Marvolo Riddle' and 'I am Lord Voldemort' are palindromes" and i am afraid you are not right.
According to its definition, palindrome is a word, number or phrase or anything else which can be read same way from left to right and from right to left.
https://en.awikipedia.org/wiki/Palindrome

Both have 19 digits, read the instructions again:

If two numbers in the argument array have the same number of digits, return the first one in the array.

Not a kata issue.

I had similar questions. I think maybe you have to figure out the most numbers you can match? So it is better to match 1 and 2 if you can vs 12?

thanks a lot!

Marked as resolved then.

'Common' in English has two meanings: 'appearing often' and 'shared'.

When we say 'the most common element' we mean 'the one that appears the most often'.

When we say 'the common element' we mean 'the one that appears in all three arrays'.

The kata is not in the least unclear, since it gives specific examples.

Common i.e appears in all 3 arrays ;-)

Not an issue, do you know what an issue means? The kata doesn't work, it has bogus tests, or to report it is a duplicate, nothing of that is happening here. At most you can use Suggestion or leave a comment.