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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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tests for JS dont work
I have no idea what any of it means, but good job
I have no clue how this "re" thing works, but I'm pretty sure I need to
Please don't spoil solutions, thanks. Take a pencil and a paper and check for this, it's pure logic.
You need to learn data structures, specifically LinkedList. Look for a course online, choosing a data structure to solve a problem is usually the most crucial step :)
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Try another kata ;-)
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I guess it is way more efficient than mine, since my is 14 lines and has 4 conditions.
But in rare ocasions that website domain ends with 'www', mine works. Mine also can work with subdomains if you change the index in the return statement from 0 to -2