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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.
Not really that bad, Golang has amortized cost of append() -> O(1)
But sure, make the array beforehand is much better in that case
The performance of this method is very low, and the append method causes the underlying array to be reallocated continuously.