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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.
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You iterate n times again with reduce to insert it into an object literal, how does it make logn?? it seems it is O(n) -- O(n)+O(n)+O(n)
May you explain why it is O(nlogn), not very experienced about big o notation