Go Defer And Recover

Feb 21, 2020

Go defer is LIFO. defer function will be executed even after panic. So put recover inside defer.

package main

import (
  "fmt"
  "time"
)

func main() {
  defer func() {
    fmt.Println("main defer")
  }()

  go func() {
    defer func() {
      if err := recover(); err != nil {
        fmt.Println("recover", err)
      }
    }()
    panic("panic here")
  }()

  time.Sleep(1 \* time.Second)
  fmt.Println("end")
}

output:

recover panic here
end
main defer