private-schrijfsels-en-notities/2023/golang-talk-han-jan-23/workshop-brainstorm-notes.markdown

Workshop golang HAN ESE jan '23

Tekst wat de workshop inhoud:

• Wat ga ik doen
• Verwachting als ze geweest zijn
• Wat moeten ze meenemen

Workshop inhoud:

"Writing a tcp server for embedded devices in Golang within hours"

Course time schedule (50 min)

- 10 min: About myself, the company I work for and Golang introduction
- 5 min: Exercise explanation
- 30 min: Golang hands-on with support from me (2 persons per exercise)
- 5 min: The outcome and questions

Bring a laptop with a browser and wifi. The Google Chrome browser is preferred. 

Slides

• https://pkg.go.dev/golang.org/x/tools/present

Interesting packages

• buffer
• net
• io

Golang online playground

• https://goplay.tools/ has working net (officieel https://go.dev/play>)

Functional Options Pattern in Golang

https://michalzalecki.com/golang-options-pattern/ https://petomalina.medium.com/dealing-with-optional-parameters-in-go-9780f9bfbd1d https://www.sohamkamani.com/golang/options-pattern/

Normaly you would fill in many parameters or pass a struct with many knobs to turn. The Optional Function Parameter Pattern in Golang deals in a unique way with module parameters which can be added and removed without extending the type with extra setter and getter functions. As options is a type they can be passed in as a slice.

Excercise

The net package

For cross platform TCP/UDP/UNIX network socket access. From the builtin net package.

• https://pkg.go.dev/net@go1.19.3

The show must go on ...

Good Golang content to keep the ball rolling

• A Tour of go
• The Go Blog
• Go talks (slides)
• Go by Example
• Yourbasic.com Golang
• Golang Weekly Newsletter
• Gopher Academy Youtube
• justforfunc: Programming in Go youtube (github)

Opdracht

• Zorg dat het programma na 16 client handlings afsluit als alle processing klaar is

TODO & Braindump

• Programming Golang since 2016
• Zet oefening met sharelink op https://goplay.tools/snippet/XOM0c7Dp0YD
• Running opensource project Syncthing macOS
• Check if firefox also works with https://go.dev/play/
• Golang uses composition for OO-like system instead of polymorphism which is easier to read and write
• GOlang has an interface type builtin to the language (e.g io.Reader)
• cmd package is special where executables are
• Multiple return values
• Variables are ALWAYS initialised (for safety)
• Slices to keep things together (len, cap, size)
• Public/private no keyword but by contract (highercase is public, lowercase private)