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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.
It's a good solution but would break if the input is a number for example.
If it where a string the concat function would still work but the result might be unexpected.
Best to test if its actually an array and provide a useful error message if its an unexpected param.