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() intParameters: 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:
// Golang program to illustrate // reflect.NumMethod() Function package main import ( "fmt"
"reflect"
) type gfg struct {
Prop string
} func (f gfg) Geek1() string { return f.Prop
} func (f gfg) Geek2() { } // Main function 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:
// Golang program to illustrate // reflect.NumMethod() Function 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