This topic doesn't have a dedicated page yet. For now, here are the links I've gathered with this tag.
Filter and map Array values with a flatMap one-liner | Stefan Judis Web Development
This seems like an interesting technique - I'd wonder about it making things read less clearly but there may be performance benefits? Although, the creation of all those intermediary arrays might also be costly?
Write Rock Solid Tests in Any Programming Language | by Bruno Lombardi | Bits and Pieces
Could be helpful to few in testing ... maybe for the Node course this week?