从分配给变量的函数获取要打印的数据

Question

// make object properties private

var Bike = function() {
    var speed = 100;                  // private variable

    function addUnit(value) {         // private function
        return value + "KM/H";
    }

    this.getSpeed = function () {     // public function
        return addUnit(speed);
    };
};

var myBike = new Bike();
console.log(myBike);

I'm doing the 'Free Code Camp" thing and this is one of the exercises. Other than the console.log(myBike); this is the solution to their exercise. However, printing out the data isn't part of the exercise and I like to print out the data. So I'm running this code in node.js and I can't get the data to print. When I run my file I get { getSpeed: [Function] } . What I think it should be is 100 KM/H . Could someone show me how to print out the data?

Answer 1

myBike is an object of type Bike , so what you're printing is actually the instance of your "class" called Bike, you need to do

console.log(myBike.getSpeed())

which is to say "invoke the getSpeed method which exists on my Bike object"