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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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right, I suggested a change related to that for the test cases. They should compare both lists.
This should compare the reference of both the orignal and the returned list. So it tests that the original list has not been mutated.
this mutates the original list
this mutates the original list.
this mutates the original list.
this is not correct, since it is mutating the original list
good example of bad coding