Name:Unknown
Clan:Arup
Member Since:Jan 2019
Last Seen:Jan 2019
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Following:236
Followers:235
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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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I'm not sure this is an efficient solution, the problem is that you are iterating through potentially the entire list twice. Lets say 90% of a million user list uses JavaScript, but only 10% of those are from Europe. You will iterate through 900K people twice with each filter. Or instead you could add an && statement there and knock it all out in one go.
Agree, should be immutable function
we have also find() now
not nice