# 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](https://go.dev/tour)
- [The Go Blog](https://go.dev/blog/)
- [Go talks (slides)](https://go.dev/talks/)
- [Go by Example](https://gobyexample.com/)
- [Yourbasic.com Golang](https://yourbasic.org/golang)
- [Golang Weekly Newsletter](https://golangweekly.com/issues)
- [Gopher Academy Youtube](https://www.youtube.com/c/GopherAcademy)
- [justforfunc: Programming in Go youtube](https://www.youtube.com/c/justforfunc) ([github](https://github.com/campoy/justforfunc))

## 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)