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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 think the isEven pipeline function is too easy to implement. I think a more complex function would make it clearer how the PipeSeq has to be implemented.
I would give a look at the invoke method, in my implementation there are redundant function calls just to comply with the specification. But maybe the alternatives are worse.