class Light {
  on() { console.log("조명 ON"); }
  off() { console.log("조명 OFF"); }
}

class LightOnCommand {
  constructor(light) { this.light = light; }
  execute() { this.light.on(); }
}
class LightOffCommand {
  constructor(light) { this.light = light; }
  execute() { this.light.off(); }
}

class RemoteControl {
  setCommand(command) { this.command = command; }
  pressButton() { this.command.execute(); }
}

const light = new Light();
const lightOn = new LightOnCommand(light);
const lightOff = new LightOffCommand(light);

const remote = new RemoteControl();
remote.setCommand(lightOn);
remote.pressButton();
remote.setCommand(lightOff);
remote.pressButton();