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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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"Do not mutate the original array/list".
When using splice you change at all the original array.
This 'splice method' add or remove an element from the original array. So it's wrong!
Yes it could. But try to keep in mind: is just for teaching good practices and how to inits variables