What's New in Go 1.14

A lightening talk looking at what is new in Go 1.14 presented at the London Gophers Meetup.

Transcript

1. @domgreen What’s new in Go 1.14 Dom Green @domgreen
2. @domgreen
3. @domgreen whois mail@domgreen.com @domgreen
4. @domgreen • GOPRIVATE environment variable ◦ Allows the setting of private repositories to get modules • GOPROXY environment variable ◦ Allows the setting of proxies to request modules from https://golang.org/doc/go1.13#modules Go 1.13 Module Improvements
5. @domgreen Go 1.13 Dealing with Errors https://blog.golang.org/go1.13-errors
6. @domgreen Go 1.13 Dealing with Errors https://blog.golang.org/go1.13-errors
7. @domgreen Go 1.14 https://github.com/golang/go/milestone/95
8. @domgreen https://github.com/golang/proposal/blob/master/design/697 7-overlapping-interfaces.md Go 1.14 Language: Overlapping Interfaces
9. @domgreen https://github.com/golang/go/issues/6977 Go 1.14 Language: Overlapping Interfaces
10. @domgreen https://github.com/golang/proposal/blob/master/design/6977-overlapping-interfaces.md Go 1.14 Language: Overlapping Interfaces
11. @domgreen https://github.com/golang/proposal/blob/master/design/6977-overlapping-interfaces.md Go 1.14 Language: Overlapping Interfaces
12. @domgreen https://github.com/golang/go/issues/6977 Go 1.14 Language: Overlapping Interfaces
13. @domgreen https://github.com/golang/go/issues/6977 Go 1.14 Language: Overlapping Interfaces
14. @domgreen Go 1.14 Ports: MacOS Last 32-bit Release https://tip.golang.org/doc/go1.14#darwin https://support.steampowered.com/kb_article.php?ref=1055-ISJM-8568 https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
15. @domgreen https://tip.golang.org/doc/go1.14#go-command Go 1.14 Tools: go mod vendoring
16. @domgreen https://tip.golang.org/doc/go1.14#go-command Go 1.14 Tools: go mod flags https://github.com/golang/go/wiki/Modules#how-can-i-track-tool-dependencies-for-a-module
17. @domgreen https://tip.golang.org/doc/go1.14#go-command Go 1.14 Tools: go mod flags
18. @domgreen Go 1.14 Tools: go mod GOINSECURE
19. @domgreen Go 1.14 Tools: Module downloading
20. @domgreen Go 1.14 Runtime: defer
21. @domgreen Go 1.14 Runtime: defer https://twitter.com/janiszt/status/1215601972281253888 Source: https://tip.golang.org/doc/go1.14#runtime
22. @domgreen Go 1.14 Runtime: defer benchcmp ./defer_1.13.1.out ./defer_1.14beta1.out benchmark [1.13.1] ns/op [1.14beta1] ns/op delta BenchmarkNotDefered-12 1.32 1.32 +0.00% BenchmarkDefered-12 31.1 2.76 -91.13% More details: https://gist.github.com/bwplotka/9e68b5be3e76b253166dbeea222efac7
23. @domgreen Go 1.14 Runtime: defer import "sync" var mtx sync.Mutex func performanceCriticalMethod() { mtx.Lock() defer mtx.Unlock() // ...do something FAST! } More details: https://gist.github.com/bwplotka/9e68b5be3e76b253166dbeea222efac7 // Write writes data to the connection. func (c *Conn) Write(b []byte) (int, error) { // interlock with Close below for { x := atomic.LoadInt32(&c.activeCall) if x&1 != 0 { return 0, errClosed } if atomic.CompareAndSwapInt32(&c.activeCall, x, x+2) { defer atomic.AddInt32(&c.activeCall, -2) break } } // ... } Excerpt from: https://github.com/golang/go/blob/go1.11.4/src/crypto/tls/conn.go#L1036
24. @domgreen Go 1.14 Runtime: asynchronously preemptible https://tip.golang.org/doc/go1.14#runtime
25. @domgreen Go 1.14 Runtime: asynchronously preemptible https://tip.golang.org/doc/go1.14#runtime
26. @domgreen https://tip.golang.org/doc/go1.14#hash/maphash Go 1.14 CoreLib: hash/maphash
27. @domgreen Go 1.14 CoreLib: "crypto/tls"
28. @domgreen Go 1.14 CoreLib: T.Cleanup https://tip.golang.org/doc/go1.14#hash/maphash
29. @domgreen Go 1.14 CoreLib: T.Cleanup https://ieftimov.com/post/testing-in-go-clean-tests-using-t-cleanup/
30. @domgreen Go 1.15 Proposals: May 2020 https://blog.golang.org/go1.15-proposals
31. @domgreen Go 2.0 The three biggest hurdles on this path to improved scalability for Go are package and version management, better error handling support, and generics. https://blog.golang.org/go2-here-we-come https://blog.golang.org/go2-next-steps
32. @domgreen Thank You! mail@domgreen.com @domgreen
33. @domgreen Questions? Discussion