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Apr 23, 2019 Replied to a topic by ht4266394 › Linux › Linux 做桌面哪个性能稳定些 |
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Apr 19, 2019 Replied to a topic by NicolayShi › 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))
}
````
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