The State of Go: Feb 2019

Go 1.12 is planned to be released in February 2019 and this talk covers what's coming up with it.

We'll talk about Go Modules, the proposals for Go 2, and all of the new things you might have missed.

This has been a staple talk of the Go devroom, opening the stage every year, and has always been a successful one.

Transcript

1. THE STATE
   OF GO
   What's new since Go 1.10
   

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2. bit.ly/sog-fosdem19
   Maartje Eyskens
   @maartjeme
   Francesc Campoy
   @francesc
   

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3. What's new since Go 1.10
   ▪ Go 1.11
   ▫ Released August 24th 2018
   ▪ Go 1.12
   ▫ Released … eventually
   ▫ Go 1.12 beta2 released on January 10th 2019
   

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4. Agenda
   Changes to:
   ● the language
   ● the standard library
   ● the tooling
   ● the community
   

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5. CHANGES TO
   THE LANGUAGE
   

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6. This page is intentionally left void
   

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7. CHANGES TO THE
   STANDARD
   LIBRARY
   

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8. Breaking Changes
   

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9. Changed behavior when typed interface to an
   implicit escaper function. Previously . Now
   ignored.
   html/template
   11
   Go 1.11
   

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10. Before: <nil>
    Now: nothing*
    * or not
    12
    

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11. Reader's UnreadRune and UnreadByte methods
    will now return an error if they are called after Peek.
    bufio
    13
    Go 1.12
    

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12. Before: nothing
    Now: bufio: invalid use of UnreadByte
    

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13. Other Interesting Changes
    

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14. templating: assignment
    Previously, only variable declaration was possible.
    Now, assignment is also supported!
    Go 1.11
    

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15. x.Replace(s, a, b, -1) → x.ReplaceAll(s, a, b)
    where x can be:
    ▪ bytes
    ▪ strings
    new ReplaceAll functions
    Go 1.12
    

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16. builtin: maps printed sorted
    Previously, in order to print a map sorted by keys:
    1. Iterate over all the keys
    2. Sort them (somehow)
    3. Iterate over the sorted keys
    4. Print key and value
    Go 1.12
    

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17. printing a map in order before
    

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18. Now, in order to print a map sorted by keys:
    1. Print the map
    WARNING: iteration order is still random.
    builtin: maps are now printed sorted
    

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19. TLS 1.3 support
    ▪ Cipher suites are not configurable (yet?)
    ▪ 0-RTT not supported
    ▪ Only if set:
    Go 1.12
    

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20. why TLS 1.3?
    Without 0-RTT
    ▪ 1 fewer round trip
    ▪ Only secure cipher suites*
    ▪ Support in all major browsers
    * in January 2019
    Go 1.12
    

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21. why TLS 1.3? TLS1.2
    Without 0-RTT
    Source: Wikipedia
    

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22. why TLS 1.3?
    Without 0-RTT
    Source: Wikipedia
    Go 1.12
    

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23. reverse proxy + websockets
    The code below now supports websockets!
    Go 1.12
    

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24. TOOLING
    

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25. go run pkg now works!
    Go 1.11
    

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26. go run dir now works!
    Go 1.11
    

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27. debugger can now run functions
    Go 1.11
    

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28. ▪ Delve v1.1.0 only
    ▪ No new variables
    ▪ All goroutines will continue
    ▪ Only when stopped at a safe point
    ▪ Only on Linux (MacOS too)
    debugger can now run functions
    Go 1.11
    

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29. godoc
    ▪ godoc CLI is deprecated
    ▪ Use go doc
    ▪ In1.12 feature complete with -all flag
    31
    

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30. godoc
    32
    ▪ godoc now show version that introduced stuff
    

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31. “For the addition of features
    in later point releases, it
    may be necessary to add
    fields to exported structs in
    the API.
    Go 1 and the Future of Go Programs
    33
    

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32. ▪ go tool vet is deprecated
    ▪ Detects wrapped fmt.Printf errors
    go vet
    34
    Go 1.11
    Go 1.12
    

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33. modules
    ▪ an alternative to GOPATH
    ▪ integrated versioning and package distribution
    ▪ details are likely to change
    ▪ Binary only packages not supported after 1.12
    ▪ No more @ in import path
    ▪ golang.org/x/tools/go/packages
    Go 1.11
    

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34. modules
    Go 1.11
    justforfunc.com
    

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35. Add custom events to runtime traces.
    Documentation: golang.org/pkg/runtime/trace
    More: bit.ly/go-udtrace
    runtime/trace: user annotations
    Go 1.11
    

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36. RUNTIME
    

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37. Couldn’t find anything for 1.12
    PERFORMANCE
    

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38. PORTS
    ▪ Go 1.11 OpenBSD 6.2 or later
    ▪ OpenBSD 6.4 only works on Go 1.11 and later
    ▪ Go 1.13 on macOS will require 10.11 or later
    ▪ Go 1.12 last release supported on FreeBSD 10.x
    ▪ Runtime: arm64 now faster
    ▪ windows/arm supports Raspberry Pi3
    ▪ RISC-V and GNU/HURD are reserved values
    

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39. ▪ Go can now compile to Web Assembly (wasm)
    More: github.com/golang/go/wiki/WebAssembly
    web assembly
    Go 1.11
    

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40. COMMUNITY
    

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41. Back in 2014 (five years ago!)
    

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42. Last year ...
    

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43. This year ...
    

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44. WOMEN WHO GO & GOBRIDGE MEETUPS
    46
    6 more than 2018: 30 chapters now!
    

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45. GO MEETUPS IN THE WORLD
    

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46. conferences
    ▪ Go Devroom @ FOSDEM 2019 (you are here)
    ▪ dotGo: Paris, March 25
    ▪ GothamGo: NYC, April 12
    ▪ GopherCon Singapore, April 24-26
    ▪ GopherCon EU: Tenerife, May 30-June 1
    ▪ GoCon Canada: Toronto, May 31
    ▪ GopherCon: San Diego, July 24-27
    

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47. THANKS!
    Francesc and
    (voiceless) Maartje
    54 Gophers by Renee French, Ashley McNamara, Egon Elbre, Sam Croswell and Miguel Molina
    

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