IoT: Espruino press button to change led state

# IoT: Espruino press button to change led state

var led = Pin(NodeMCU.D4);
var toggle=1;
var sensor = Pin(NodeMCU.D7);

function updateLed(){
  digitalWrite(led, toggle);
  toggle=!toggle;
}

function button_down() {
  updateLed();
  print('button');
}

setWatch(button_down,NodeMCU.D3, {repeat:true, edge:"falling"});