Golang : How to get struct field and value by name



Tags : golang struct-field

In Go, there are times when we need to find out the value of a field in a given structure base on the name of the field. This tutorial will show how to use the reflect package to find out the associated value from the field name.

 package main

 import (
 "fmt"
 "reflect"
 )

 type Employee struct {
 Name string
 Age  int
 Job  string
 }

 func getFieldString(e *Employee, field string) string {
 r := reflect.ValueOf(e)
 f := reflect.Indirect(r).FieldByName(field)
 return f.String()
 }

 func getFieldInteger(e *Employee, field string) int {
 r := reflect.ValueOf(e)
 f := reflect.Indirect(r).FieldByName(field)
 return int(f.Int())
 }

 func main() {
 e := Employee{"Adam", 36, "CEO"}
 fmt.Println(getFieldString(&e, "Name"))

 fmt.Println(getFieldInteger(&e, "Age"))

 fmt.Println(getFieldString(&e, "Job"))

 }

Output :

Adam

36

CEO

Recommended reading on how to use reflect :

http://blog.golang.org/laws-of-reflection

References :

https://www.socketloop.com/tutorials/golang-print-out-struct-values-in-string-format



Tags : golang struct-field

By Adam Ng

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