Finally, let’s use our new methods to access and manipulate data from Dog instances.

class Dog {
  constructor(name) {
    this._name = name;
    this._behavior = 0;
  }

  get name() {
    return this._name;
  }

  get behavior() {
    return this._behavior;
  }   

  incrementBehavior() {
    this._behavior++;
  }
}

const halley = new Dog('Halley');

In the example above, we create the Dog class, then create an instance, and save it to a variable named halley.

The syntax for calling methods and getters on an instance is the same as calling them on an object — append the instance with a period, then the property or method name. For methods, you must also include opening and closing parentheses.

Let’s take a moment to create two Dog instances and call our .incrementBehavior() method on one of them.

let nikko = new Dog('Nikko'); // Create dog named Nikko
nikko.incrementBehavior(); // Add 1 to nikko instance's behavior
let bradford = new Dog('Bradford'); // Create dog name Bradford
console.log(nikko.behavior); // Logs 1 to the console
console.log(bradford.behavior); // Logs 0 to the console

In the example above, we create two new Dog instances, nikko and bradford. Because we increment the behavior of our nikko instance, but not bradford, accessing nikko.behavior returns 1 and accessing bradford.behavior returns 0.