go recover panic

tags: learning go programming

content

• recover has to be put inside of a deferred function

func main() {
	defer func() {
		if r := recover(); r != nil {
			fmt.Println("all's good")
		}
	}
	panic("No!")
}

• the above code works, because defer means the code will be run before the function returns, no matter what (even if the function panics)

• in the case where recover() is not in defer

  • if recover is before panic, it doesn’t do anything cuz no panic yet
  • if it’s after panic, it won’t even be executed, cuz the code panics and passes the panic to the call stack before it could be executed

up

• go-defer

down

reference