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reflect.FieldByName() Function in Golang with Examples

  • Last Updated : 03 May, 2020
Geek Week

Go language provides inbuilt support implementation of run-time reflection and allowing a program to manipulate objects with arbitrary types with the help of reflect package. The reflect.FieldByName() Function in Golang is used to get the struct field with the given name. To access this function, one needs to imports the reflect package in the program.

Syntax:

func (v Value) FieldByName(name string) Value

Parameters: This function accept only single parameters.

  • name: This parameter is the string type.

Return Value: This function returns the struct field with the given name.

Below examples illustrate the use of the above method in Golang:



Example 1:




// Golang program to illustrate
// reflect.FieldByName() Function 
   
package main
   
import (
    "fmt"
    "reflect"
)
  
type Struct1 struct {
    Var1       string
    Var2       string
    Var3       float64
    Var4       float64
}
  
// Main function 
func main() {
    NewMap := make(map[string]*Struct1)
    NewMap["abc"] = &Struct1{"abc", "def", 1.0, 2.0}
    subvalMetric := "Var1"
      
    for _, Value:= range NewMap {
        s := reflect.ValueOf(&Value).Elem()
        println(s.String())
        println(s.Elem().String())
          
        // use of FieldByName() method
        metric := s.Elem().FieldByName(subvalMetric).Interface()
        fmt.Println(metric)
    }
      
}
     

Output:

<*main.Struct1 Value>
<main.Struct1 Value>
abc

Example 2:




// Golang program to illustrate
// reflect.FieldByName() Function 
   
package main
   
import (
    "fmt"
    "reflect"
)
  
// Main function 
func main() {
    type t struct {
            N int
    }
    var n = t{76}
    fmt.Println(n.N)
      
    // use of FieldByName() method
    reflect.ValueOf(&n).Elem().FieldByName("N").SetInt(4)
    fmt.Println(n.N)    
}

Output:

76
4



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