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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 changed it to this:
"(The highest/lowest element is respectively only one element at each edge, even if there are more than one with the same value!)"
I hope, it is clearer now! ;-)
It's an arrow function, it's a anonymous short-hand function which acts like a lambda expression.