Setters and getters

const robot = {
  _model: '1E78V2',
  _energyLevel: 100,
  _numOfSensors: 15,
  get numOfSensors(){
    if(typeof this._numOfSensors === 'number'){
      return this._numOfSensors;
    } else {
      return 'Sensors are currently down.'
    }
  },
  set numOfSensors(num){
      if(typeof num === 'number' && num >= 0){
          this._numOfSensors = num;
      }
      else{
          console.log('Pass in a number that is greater than or equal to 0');
      }
  }
};

robot.numOfSensors = 100;
console.log(robot.numOfSensors);