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);