hold my beer

The dir's order makes mistake for me(Chinese), I think the array2 is the order dic.Fuck

Damn. I feel stupid writing over 6 lines

jesus

As a word of caution to future professional developers:

I'd be leery of using match with a string. This turns into a regex, which has special meaning. If array1 contained any strings with non-letter chars, like '.', the match would trip up certain tests.

e.g. 'hello'.match('h.l.o') returns a match.

Also, if someone were trying to be malicious, it could be worse (could potentially crash things).

e.g. 'hello world'.match('(((((((.*)*)*)*)*)*)*)*x'), in Firefox, freezes for a few seconds.

I like this solution, it is concise and easy to read

It returns duplicates :'(

I guess it doesn't make an error when you access the arr[i+1] when i = arr.length-1. It shoud say try to access undefined.

Check this one as well;
https://www.codewars.com/kata/reviews/5bbb8890484fcd36fb0020cc/groups/5bbcf8a3b6dfbb59fc0028bb

the most beautiful thing I've ever seen

oh I think this is much simple solution