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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.
Try removing it and see.
Hello, if it is not going to be used why put there?
It's a convention for variables in a signature that aren't going to be used in the function. Since only
iwas used in the function code, the variable that contains the elements value was given the name_to indicate that it's not used.