go reflect method call

main.go

package main

import (
	"fmt"
	"reflect"
)

var funcOp = map[string]string{
	"+": "Add",
	"-": "Sub",
	"/": "Divide",
	"*": "Multiply",
}

type Calculator struct{}

func (*Calculator) Add(a int, b int) int {
	return a + b
}

func (*Calculator) Sub(a int, b int) int {
	return a - b
}

func (*Calculator) Divide(a int, b int) int {
	return a / b
}

func (*Calculator) Multiply(a int, b int) int {
	return a * b
}

func main() {
	var a, b = 6, 2
	c := &Calculator{}
	ct := reflect.TypeOf(c)
	for op, opFun := range funcOp {
		if method, ok := ct.MethodByName(opFun); ok {
			params := make([]reflect.Value, 3)
			params[0] = reflect.ValueOf(c)
			params[1] = reflect.ValueOf(a)
			params[2] = reflect.ValueOf(b)
			v := method.Func.Call(params)
			fmt.Println(fmt.Sprintf("%d %s %d = %d", a, op, b, v[0].Int()))
		}
	}

}