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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.
Are there other values that would cause it to stop? like 0 or NaN?
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Yes, as the loop stops when value of 'node' is falsy,
flnal loop changes value of 'node' to 'null' and makes next loop stop.