How to dynamically set a variable in a defer call

Question

Example code:

package main

import (
    "errors"
    "fmt"
)

func main() {
    err := errors.New("error 1")
    defer fmt.Println(err)

    err = errors.New("error 2")
}

In this case, I want fmt.Println to print out error 2.

Answer 1

err is already defined when you set the defer so what you what you likely want to do is wrap it in a func like below. Hope this helps.

package main

import (
    "errors"
    "fmt"
)

func main() {
    err := errors.New("error 1")

    defer func() {
      fmt.Println(err)
    }()

    err = errors.New("error 2")
}