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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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parseInt() breaks after the first non-numerical character and returns the numerical part. Number() tries to convert the whole thing.
The best rundown of the differences between the different number casting is shown here: http://stackoverflow.com/a/17106702
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