reflect.MethodByName() 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.MethodByName() Function in Golang is used to get function value corresponding to the method of v with the given name. To access this function, one needs to imports the reflect package in the program.

Syntax:

func (v Value) MethodByName(name string) Value

Parameters: This function does not accept any parameter.

Return Value: This function returns a function value corresponding to the method of v with the given name.

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

Example 1:

// Golang program to illustrate
// reflect.MethodByName() Function

package main

import (
    "fmt"
    "reflect"
)

// Main function
type T struct {}

func (t *T) GFG() {
    fmt.Println("GeeksForGeeks")
}

func main() {
    var t T
    reflect.ValueOf(&t).MethodByName("GFG").Call([]reflect.Value{})
}

Output:

GeeksForGeeks

Example 2:

// Golang program to illustrate
// reflect.MethodByName() Function

package main

import (
    "fmt"
    "reflect"
)

// Main function

type YourT2 struct {}
func (y YourT2) MethodFoo(i int, oo string) {
    fmt.Println(i)
    fmt.Println(oo)
}

func Invoke(any interface{}, name string, args... interface{}) {
    inputs := make([]reflect.Value, len(args))
    for i, _ := range args {
        inputs[i] = reflect.ValueOf(args[i])
    }
    reflect.ValueOf(any).MethodByName(name).Call(inputs)
}

func main() {
     Invoke(YourT2{}, "MethodFoo", 10, "Geekforgeeks")
}

Output:

10
Geekforgeeks