O(1) cmd parser

CmdParser.go

package main

import "fmt"

type CMD interface {
	doAction(user string)
}

type EAT struct {
}

type LOOK struct {
}

func (look *LOOK) doAction(user string) {
	fmt.Println(user, "are looking")
}

func (eat *EAT) doAction(user string) {
	fmt.Println(user, "are eating")
}

func main() {

	var cmds [10]CMD
	cmds[0] = &EAT{}
	cmds[1] = &LOOK{}

	call(cmds[0], "junjun")
	call(cmds[1], "stephen")
}
func call(cmd CMD, user string) {
	cmd.doAction(user)
}