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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.
Yup. That's totally the reason. If you create a new array while doing the for loop, i'm sure it will be close.
The main reason for the difference in performance might be because the for-loop is mutating the input array (in-place), whereas the map() implementation outputs a new array.
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thank you for this. The differences between these two methods eseems like one of those instances where actually knowing the subtle differences could save you from a serious headache.
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You won't find a better example than this to start.
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