Go

• easy way to compile and run on file changes: nodemon -e go --exec go run main.go --signal SIGTERM
• access private repositories: export GOPRIVATE=repo-name

go cli

• create go module project: go mod init <name>
• add dependency to go.mod: go get <lib-name>
• clean go.mod file, add used dependncies, remove unused dependencies: go mod tidy
• download all dependencies from go.mod: go get ./...
• clean go cache: go clean -cache -modcache -i -r
• list library versions: go list -m -versions <lib-name>

tips

• never use pointer semantics during construction, use value semantics instead:

// bad
p := &person{
    name: "bill",
}
functionName(p)

// good
p := person{
    name: "bill",
}
functionName(&p)

• for buillt-in types and reference types (map, slices, etc) use always values semantics

• cross compile to windows: GOOS=windows GOARCH=amd64 go build main.go

• to debug in mac m1 compile with the following envirable variables: GOOS=darwin, GOARCH=arm64
• recover go routine after panick:

func recoverer(maxPanics, id int, f func()) {
    defer func() {
        if err := recover(); err != nil {
            fmt.Println("HERE", id)
            fmt.Println(err)
            if maxPanics == 0 {
                panic("TOO MANY PANICS")
            } else {
                go recoverer(maxPanics-1, id, f)
            }
        }
    }()
    f()
}

conventions

• package names are not plural

articles:

• https://www.uber.com/en-PT/blog/go-geofence-highest-query-per-second-service/

multiline strings

    multilineString := `This is a
multiline string
in Go!`