Class Intro

<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Classes are written in "strict mode"</h2>

<p>In a JavaScript Class you cannot use variable without declaring it.</p>

<p id="demo"></p>

<script>
class Car {
  constructor(name, year) {
    this.name = name;
    this.year = year;

  }
  age() {
   // date = new Date();  // This will not work
   let date = new Date(); // This will work
   return date.getFullYear() - this.year;
  }
}

myCar = new Car("Ford", 2014);
document.getElementById("demo").innerHTML =
"My car is " + myCar.age() + " years old.";
</script>

</body>
</html>