Briancbn/go-notes

Go

Notes for Go

Installation

Install go 1.22.0 in /usr/local

curl -OL https://golang.org/dl/go1.22.0.linux-amd64.tar.gz
sudo tar -C /usr/local -xvf go1.22.0.linux-amd64.tar.gz

Run the following line or add them to .bashrc

export PATH=/usr/local/go/bin:$PATH

Initialize the go.mod

go mod init example.com/hello

Update dependencies

go mod tidy

To build your go code

go build

You can look up modules here https://pkg.go.dev.

Module

Function with capital letter at the start is an exported function!
:= is define and assignment 2 in 1
for local dependency, can do a simple hack fix like the following
```
go mod edit -replace example.com/greetings=../greetings
```
The command specifies that example.com/greetings should be replaced with ../greetings for the purpose of locating the dependency.

The run this to synchronize the dependency
```
go mod tidy
```
for is Go's while

Download external dependencies

go get golang.org/x/example/hello/reverse

Workspace

Initialize workspace
```
go work init ./hello
```
Add additional module to the workspace
```
go work use ./example/hello
```

Testing

Name the test file with _testing.go
All functions should start with func Test..()
Run the test using
```
go test -v
```

Install

Check the install path

go list -f '{{.Target}}'

Change bin location

go env -w GOBIN=/path/to/your/bin

Reset the bin location

go env -u GOBIN

Install the binary

go install

Cheat sheet

Effective Go - https://go.dev/doc/effective_go
Go module references - https://go.dev/ref/mod