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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.
a accumulates the array item values by adding them. That's the first +. The second + converts the array item b from a string into a number so it can be added to the accumulator a.
I'm not sure what the 'a + +(b)' in the reduce is doing exactly. And I'm not having luck finding an explination. Could you explain what happening there? Thank you :)