yeah if you have only one argument to pass then no need for the paranthesis if you have more then one then you need to put paranthesis around argument ( pardon my english )

And mine! ;)

great! :D

your update message: but why? i have the same problem and i don't get it :(

Once correct solution is when word is inserted before word with the same index and another time is correct when it is after word with the same index, why???
Any advise, will be appreciate

Hi, generally it's a good practice to put 'break' but in some scenario without it might be tricky: For example => when you put bad login, you need to log again and after 3 attempt you will be blocked or whatever and now betweem case 1 and case 3 you can put some info but no need to break it. Maybe it's not a top example but always xd.

In sample tests is one incorrect test Test.assertDeepEquals(capitalize("bacdef",[1,2,5]),'aBCdeF'); JavaScript

it's nice when you take first element in method 'every', but most of people solve it in another way.

Why would it be a kata issue?

What do you mean you cannot submit it? See if this can help you: Troubleshooting Your Solution.

See if this can help you: Troubleshooting Your Solution.

my code passes sample tests but not after I click atempt someone can explain it to me?