reflect.NumMethod() 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.NumMethod() Function in Golang is used to get the number of exported methods in the value’s method set. To access this function, one needs to imports the reflect package in the program.
Syntax:
func (v Value) NumMethod() int
Parameters: This function does not accept any parameter.
Return Value: This function returns the number of exported methods in the value’s method set.
Below examples illustrate the use of the above method in Golang:
Example 1:
package main
import (
"fmt"
"reflect"
)
type gfg struct {
Prop string
}
func (f gfg) Geek1() string {
return f.Prop
}
func (f gfg) Geek2() {
}
func main() {
fooType := reflect.TypeOf(gfg{})
for i := 0; i < fooType.NumMethod(); i++ {
method := fooType.Method(i)
fmt.Println(method.Name)
}
}
|
Output:
Geek1
Geek2
Example 2:
package main
import (
"log"
"reflect"
)
type Reindeer string
func (r Reindeer) TakeOff() {
log .Printf( "%q lifts off." , r)
}
func (r Reindeer) Land() {
log .Printf( "%q gently lands." , r)
}
func (r Reindeer) ToggleNose() {
if r != "rudolph" {
panic( "invalid reindeer operation" )
}
log .Printf( "%q nose changes state." , r)
}
func main() {
r := Reindeer( "rudolph" )
t := reflect.TypeOf(r)
for i := 0; i < t.NumMethod(); i++ {
m := t.Method(i)
log .Printf( "%s" , m.Name)
}
}
|
Output:
2009/11/10 23:00:00 Land
2009/11/10 23:00:00 TakeOff
2009/11/10 23:00:00 ToggleNose
Last Updated :
05 May, 2020
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