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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.
No, splice is mutative. Never mutate when writing functional code, which is clearly what this problem is asking for.
Wouldn't splice mutate numbers?
'The number will be passed in as a string',the description says it clearly