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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 was confused until I read your description. Then it went quickly. I think the biggest help was:
Good point. Description has been updated.
Please change the description example to use non-number value in the array.
Ex: var helper = new PaginationHelper(['a','b','c','d','e','f'], 4);
The way it is now make it very difficult to grok the intention/inputs of functions like pageIndex()