I'm having an issue with the Javascript version of this challenge. On my local IDE, using the same language version and same test inputs, the test for the first case returns the correct anser of "A B C", however, when performing the same task on the kata, the function returns "A B C". This is especially odd considering that utilizing the .join() method with '/' instead of ' ' returns the correct answer with backslashes instead of spaces ("A/B/C"), but as soon as it is switched back to .join(' '), the test returns "A B C". This seems to be an issue with the kata. I will reply with my solution as a spoiler.

that's what makes it so powerful. you can still go off and write your own methods/solutions to problems you encounter much like you would in java, but if you happen to know little tricks like these it can make the whole process much easier.