Swiftweekly.github.io: [126] Issue #126 - January 24, 2019

[BasThomas]

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[BasThomas]

I've finished up an interesting research project, trying to answer the question: is Swift a good language for high performance numeric programming in Mac and Linux? And the answer: yes it is!

I think this has the potential to be great for data science.

https://www.fast.ai/2019/01/10/swift-numerics/ https://twitter.com/jeremyphoward/status/1083440518527217664/photo/1

[fassko]

https://github.com/apple/swift-evolution/pull/974

Introduces a folding operator that seeds itself from the elements passed to reduce, removing the need for an explicit value seed.

This proposal adds a "simple, useful (if fairly low-priority) addition" to the standard library.

_{Sent with GitHawk}

[BasThomas]

239 accepted

[fassko]

Swift scripts without any dependencies https://github.com/mxcl/swift-sh

_{Sent with GitHawk}

[fassko]

Deep dive into subtleties of protocol extensions

https://swiftindepth.com/2019-01-13/the-subtleties-of-protocol-extensions

[fassko]

Some progress in porting Swift to Windows https://forums.swift.org/t/swift-corelibs-foundation-windows-and-build-option-defaults-recommendations/19463

[fassko]

Initiative by @loiclec adding support for fuzz testers in Swift packages

https://forums.swift.org/t/support-for-fuzz-testers-in-swift-packages/19494

[BasThomas]

https://twitter.com/dgregor79/status/1085057290468614145

SwiftLang SE-0240 :Ordered Collection Diffing" is in review until January 22nd, 2019: https://forums.swift.org/t/se-0240-ordered-collection-diffing/19514

[fassko]

https://forums.swift.org/t/se-0240-ordered-collection-diffing/19514 in review to Jan 22

_{Sent with GitHawk}

[fassko]

Trailing commas in all expression lists

https://github.com/apple/swift-evolution/pull/976

_{Sent with GitHawk}

[BasThomas]

Finally
https://twitter.com/jckarter/status/1085303872883613696

[BasThomas]

https://www.swiftcommunitypodcast.org / https://github.com/SwiftCommunityPodcast/podcast

[BasThomas]

https://twitter.com/slava_pestov/status/1085691914328920066

Short history of non-escaping functions:

• Swift 4.1 and earlier: type checker enforcement; same ABI as escaping
• Swift 4.2: new ABI - the context is a trivial pointer and not ref-counted like with escaping
• now: non-escaping contexts allocated on stack https://github.com/apple/swift/pull/21933

[BasThomas]

https://twitter.com/slava_pestov/status/1085692131623256066

Best kind of bug fix - combine two code paths, fixing edge case neither one could handle: https://github.com/apple/swift/pull/21932

[BasThomas]

https://twitter.com/jckarter/status/1085965768527773696

If you want to try out opaque result types in Swift, I now have a prototype implementation: https://forums.swift.org/t/opaque-result-types/15645/250

[BasThomas]

https://twitter.com/stephencelis/status/1085976372248485890
https://forums.swift.org/t/key-path-expressions-as-functions/19587

[BasThomas]

https://twitter.com/cocoawithlove/status/1086581405625180161

I played around with Swift master's new stack allocated closure contexts today. My "capturing closure" mutex test case from this article:

http://www.cocoawithlove.com/blog/2016/06/02/threads-and-mutexes.html

improved 10x from 2.051 seconds to 0.212 seconds. Putting it within 20% of the inlined version.

[BasThomas]

Published 🎉, thanks a lot for helping out again, @fassko!