I did almost the same thing. Your code is good, deserves more upvotes

I had this....but also had a conditional or else how would it work for characters with two characters?

Not a kata issue.

Print the arguments, and:

Your task is to write a function that takes two or more objects and returns a new object which combines all the input objects.

It does say two or more there. You don't need to discover anything if you read that.

I can't understand Incredible flight of the authors fantasy. In the example section he shows that function must work with 2 arguments, looking in base tests we need to discover that function can have three arguments... OK, I wrote solution that pass all base tests but when I press "Attempt" button I recived 10 passed and 11 wrong.
I think the problem occours because of incorrect or incomplete initial information.

How I can guess what data contains failed tests?

Ok i guess i found it thanks

Guys, help please. I am mot native in english. What this "Objects are combined together so that the values of matching keys are added together." properly mean? Is it means that I should "+" values of matching keys? Because if I am right, it seems that test values are wrong. I knew the given objects with console log, and combined them in my head. Also part of tests for my solution passed. So this is an issue (if i translated correctly). If I understood incorrectly what combine means, can someone please explain?

approved by someone

.slice() will create a new word from the start to before the end. so slice(1, 4) will be from 1 to before 4.

Well, I'll say this is far from 7 kyu. 8 kyu was like peanuts, and 7 others went well, and this one, well, I think the level of 6-5(
Difficult, and it was not interesting at all(

yup

good one