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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.
This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution
It makes a slice of the array, because the trait wasn't implemented for arrays at the time of writing the solution. There's no reason to use it now in this case.
What does the [..] do? The code runs without it but I assume it has a purpose