Simple Condition

simple_condition.go

package main

import "fmt"

func addNumber(x, y int) int {
	return x + y
}

func subtractNumber(x, y int) int {
	return x - y
}

func divideNumber(x, y int) int {
	return x / y
}

func multiplyNumber(x, y int) int {
	return x * y
}

var FilterMap = map[string]interface{}{
	"add": addNumber,
	"sub": subtractNumber,
	"mul": multiplyNumber,
	"div": divideNumber,
}

func calculateNumber(x, y int, param string) int {
  // since go can't assign action value if lookup table is not found
  // so we need to check if keys is exists in hash map
	if cal, ok := FilterMap[param]; ok {
		return cal.(func(int, int) int)(x, y)
	}
	return 0
}

func main() {
	var x, y = 10, 2
	fmt.Println(calculateNumber(x, y, "div"))
}