Common error handling pattern

go_error_handling.go

package main

import (
	"fmt"
	"os"
)

func main() {
	exit(run())
}

func exit(err error) {
	if err == nil {
		os.Exit(0)
	}
	fmt.Printf("%s", err)
	os.Exit(1)
}

func run() error {
	fmt.Println("Hello world")
	return nil
}