Skip to content

Latest commit

 

History

History
141 lines (108 loc) · 3.28 KB

go-commands.md

File metadata and controls

141 lines (108 loc) · 3.28 KB
Raw

Go Notes

Go Environment Variables

go env
GOOS="linux" go build
GOOS="darwin" go build
GOOS="windows" go build

# GOROOT tells us where the go runtime is installed
GOROOT

# GOPATH tells us where the local go projects live
# this is the go workspace that we create after the goruntime installation
GOPATH

## edit | add env variable in linux
# "$" -> variable
# User settings
export GOROOT=/usr/local/go
export GOPATH=$HOME/workspace
export PATH=$PATH:GOROOT/bin:$GOPATH/bin

Go Sub folders

/go
1. /src
 - it contains all the library packages
2. /bin
 - /go
   - it contains executables or programs that come with go runtime
   - with go executables you can run commands like "go version", "go build" and so on
 - /gofmt
   - for making code look pretty while development


/goworkspace
# we need to create this for our local go projects
# we can name it whatever we want
# just make sure to create 3 sub folders in it
1. /scr
  - for source code of future go projects
2. /bin
  - for executable of future go projects
  - files inside this folder are auto-generated
3. /pkg
  - for package and dependencies of future go projects
  - files inside this folder are auto-generated


source
- https://www.youtube.com/watch?v=k8LClK96NZ4

Go Mod Edit

go mod edit -go <version(1.16)> go mod edit -module

go get -u github.com/gorilla/mux go get go.mongodb.org/mongo-driver/mongo

// update which works when mux is not working properly go install golang.org/x/tools/gopls@latest

go mod

  • Go modules is a native package management tool
# (an expensive operation so better keep eye on that while running this command)
go mod tidy
go mod verify

go list go list all (get all package) go list -m all (get all package used only)

go list -m --versions github.com/gorilla/mux go list -m -versions github.com/gorilla/mux

go mod why github.com/gorilla/mux go mod graph

go mod vendor (orver write modules) (almost like node_modules) (now it will not bring everything form the web) (bring everything at one time pack everything inside) (to run from vendor) go run -mod=vendor main.go (first look everything into vendor folder)

go run main.go (bring everything from the web or chache to run not from the vendor)

go run -race example.go (check for the race condition in the program)

Ctrl + P then type "go tools" in vscode to install update tools for go (like gopls)

// run everything

  • go run .

check for race condition

go run --race . // exit status 66

PACKAGE

Types of packages in go

  • executable packages
    • main function
    • main package
    • entry point of every program execution
  • non-executable packages
    • non main | utility package (all not main packages are utility package)
    • not self executable
    • utilized by main package

Package Naming

  • short, no camel/snake
  • descriptive
  • same name as directory name
    • don't declare multiple packages in multiple files under the same directory
  • package should be small and many

Package scope

Note - circular references is not allowed among packagesF

  1. block scope
  • inside the function block { }
  1. unexported
  • outside of function body
  • camelcase -> "variableName"
  1. exported
  • outside of function body
  • capitalcase -> "VariableName"

🌐 source