getting panic() argument in defer function in GO lang -

i have function calling function b sometime call panic based on invalid data. in function defer function, know message function b passed panic() can report error in json on network client.

e.g.

func a( abc data) result string{   defer func(){     // panic args , return result.   }    xx = b( abc[0] );   yy = b( abc[1] );   ... } 

the reason function b use panic avoid large amount of

err := b(abc) if err != nil {     ... } 

in function , make code easier read , maintain.

for example:

package main  import (         "errors"         "fmt" )  func a(s string) (result string, err error) {         defer func() {                 if e := recover(); e != nil {                         switch x := e.(type) {                         case error:                                 err = x                         default:                                 err = fmt.errorf("%v", x)                         }                 }         }()          b(s)         return "returned", nil }  func b(s string) {         switch s {         case "ok":                 return         case "fail":                 panic(errors.new("failed"))         case "fail miserably":                 panic(42)         default:                 a, b := 1, 0                 if a/b != 0 {                         panic("ouch")                 }         } }  func main() {         s, err := a("ok")         fmt.printf("%q, %t(%#v)\n", s, err, err)          s, err = a("fail")         fmt.printf("%q, %t(%#v)\n", s, err, err)          s, err = a("fail miserably")         fmt.printf("%q, %t(%#v)\n", s, err, err)          s, err = a("")         fmt.printf("%q, %t(%#v)\n", s, err, err) } 

playground

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output:

"returned", <nil>(<nil>) "", *errors.errorstring(&errors.errorstring{s:"failed"}) "", *errors.errorstring(&errors.errorstring{s:"42"}) "", runtime.errorstring("integer divide zero")