reflect.FieldByName() Function in Golang with Examples
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) ValueParameters: 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