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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.
Although I initially like my version better, I like the exiplitness and clarity of this version.
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dcba, like you were reading it right to left
reverse("abcd") // dbca <-- or dcba?
In my opinion, best practice would be to assign 'this' to a variable.