https://github.com/cassidycodes/hellogo

GoBridge Workshop
https://github.com/cassidycodes/hellogo

Last synced: 19 days ago
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GoBridge Workshop

• Host: GitHub
• URL: https://github.com/cassidycodes/hellogo
• Owner: cassidycodes
• Created: 2019-09-21T17:18:52.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2019-09-21T20:33:05.000Z (about 5 years ago)
• Last Synced: 2024-06-21T03:33:26.113Z (5 months ago)
• Language: Go
• Size: 3.91 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

        
# GoBridge Workshop

Notes and code from a GoBridge workshop: https://idiomat.gitbook.io/gobridge/

## Notes

* Before 1.13 go was opinionated about where go code lived. If $GOPATH is not set, it expexts the code to be in ~/go

* Go has default values, called a "zero value", for each type. For a string it is an empty string, for an int it is 0.

* Use `:=` to simultaneously declare and assign a new variable. This is called declaration in assignment.

  * If you attempt to declare a var again, you get an error that says "no new varibels on left side of :=".

  * You cannot use `:=` outside of `main`

* Strings defined with back ticks interprets the contents literally. Double quotes are not like this.

* Double quotes allow for interpolation, backticks do not.

* Single quotes can only contain one character. This is called a rune. Runes are an alias for [int32](https://devdocs.io/go/builtin/index#int32)

* Variables declared outside of the function body are global.

* `package` at the beginning of a file is used to say that different files are in the same scope.

* Uppercased identifiers like `Name` are exported (aka visible outside of the package when the package is imported). Lowercase are not.

* when using slice's `append`, you need to assign the result to a variable. Otherwise the original variable still points to the old data.

## `GOPATH`

I got confused about GOPATH while working on this. If you compare the direcotry structure here to how the [workshop](https://idiomat.gitbook.io/gobridge/your-first-go-program#action-steps-2) says to set up the code, you'll notice I did a few things different.

`$GOPATH` is meant to contain sources that have Go code in them. If you are trying to import a library, like I did in [gettingStarted/main.go](gettingStarted/main.go), you need to set the `GOPATH` to the current directory.

You can do this with ``export GOPATH=`pwd``. Since I set this code up with multiple directories, I made a bash function in my bash profile so I could quickly change my `GOPATH`.

```bash

function setgopath() {

 export GOPATH=`pwd` && echo "GOPATH is set to $GOPATH"

}

```

## Resources

* https://godoc.org

* https://play.golang.org/

* https://gobyexample.com/