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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.
Same here
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You can use a "reduce" method every time you need a single value derived from all array elements. Just that simple.
You probably already figured it out but you only need a block statement (curly braces) when using multiple statements