dust09 最近的时间轴更新 dust09 最近的时间轴更新 |
dust09V2EX 第 402466 号会员，加入于 2019-04-17 10:14:12 +08:00 |
dust09 最近回复了
2019-04-23 09:24:19 +08:00 回复了 ht4266394 创建的主题 › Linux › Linux 做桌面哪个性能稳定些 |
openSUSE
2019-04-19 16:51:03 +08:00 回复了 NicolayShi 创建的主题 › PHP › 请教大家一段 golang 代码，为什么会输出两个 nil ~ |
DoTheThing 函数内 err 不是同一个
````go
package main
import (
"errors"
"fmt"
)
var ErrDidNotWork = errors.New("did not work")
func DoTheThing(reallyDoIt bool) (err error) {
fmt.Println("err:",&err)
if reallyDoIt {
result, err := tryTheThing()
if err != nil || result != "it worked" {
err = ErrDidNotWork
}
fmt.Println("err:",&err)
}
return err
}
func tryTheThing() (string,error) {
return "",ErrDidNotWork
}
func main() {
fmt.Println(DoTheThing(true))
fmt.Println(DoTheThing(false))
}
````
````go
package main
import (
"errors"
"fmt"
)
var ErrDidNotWork = errors.New("did not work")
func DoTheThing(reallyDoIt bool) (err error) {
fmt.Println("err:",&err)
if reallyDoIt {
result, err := tryTheThing()
if err != nil || result != "it worked" {
err = ErrDidNotWork
}
fmt.Println("err:",&err)
}
return err
}
func tryTheThing() (string,error) {
return "",ErrDidNotWork
}
func main() {
fmt.Println(DoTheThing(true))
fmt.Println(DoTheThing(false))
}
````
Select Language