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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 tend to disagree, this way of doing thing is similar to functional programming.
I woulad have added a map step for the replace call.
ALready said but of course a joining is better than this reduce combined with the get call.
If you absolutely want to a use a reduce, maybe you can use the other version with a initializer
".reduce("", ...)