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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.
For example, if you have a loop that calculates Math.floor(integer / 2) in each iteration, and this value doesn't change throughout the loop, you can calculate it once before the loop and then use the precalculated value inside the loop. This can improve the performance of your code, especially for large numbers or when the loop is executed many times.