You may find this article I wrote useful background for understanding the capabilities of numerical computing in Swift, including details about a library which provides features overlapping with the new Swift package: <a href="https://www.fast.ai/2019/01/10/swift-numerics/" rel="nofollow">https://www.fast.ai/2019/01/10/swift-numerics/</a>
I am also happy to see that sometime in the last several years slices of arrays became views rather than copies. <a href="https://developer.apple.com/documentation/swift/arrayslice" rel="nofollow">https://developer.apple.com/documentation/swift/arrayslice</a>
Does anyone use Swift (in production) for backend services not related at all to the Apple ecosystem? It seems like a better Golang to me, but the tooling space only targets Apple stuff.