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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.
I have no idea what that means but ill take your word for it.
.reverse`` instead of .reverse() works too.It's "Tagged Template Literals".
"If there is an expression preceding the template literal, this is called a tagged template. In that case, the tag expression (usually a function) gets called with the template literal, which you can then manipulate before outputting."