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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.
Get started now by creating a new collection.
thank you @cwps, the problem is that this is happening in test.js file which is not accesible for me. I do not call map function in my code, that is why I do not know, how to continue right now :)
Any hints guys? I really do not know what I am missing here - this is the only error I get. Everything else is ok. - TypeError: arr.map is not a function at addOneArr (test.js:78:18)
Thank you for this post, can you explain it more for us? THE BEST solution above is just O(n) complex am I right?