Loading collection data...
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.
I don't know how JIT would handle this. It's potentially less efficient if the filter constructs a different Array before proceeding... but if I cared about that level of performance I would probably not be using JavaScript to begin with. :)
When in doubt, favor readability over optimization. Knuth, BWK, and others will tell you premature optimization is the root of all evil.
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Yes. You right.