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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.
Maybe still not supported: link
The difference between these function shows only when incorrect number is provided. Number will return NaN when parseFloat tries to trim non-numeric chars and parse what remains.