1. Open your command line application and navigate to your workspace.
2. Create a new folder named 08-10-use-throw-to-simulate-abstract-class.
3. Copy or create an index.html that loads and runs a main function from main.js.

4. Create a main.js file that defines a new class named Rocket. In the constructor, check the constructor of the instance, if it's Rocket, then throw an error:

// main.js 
class Rocket { 
  constructor (name) { 
    this.name = name; 
    if (this.constructor === Rocket) { 
      throw new Error('Abstract Class Should not be 
      instantiated'); 
    } 
  } 
}  

5. Create two child classes of Rocket:

// main.js 
class ActiveRocket extends Rocket {} 
class InactiveRocket extends Rocket {} 

6. Create a main function that creates instances of each class of rocket. Notice that the Rocket class can't be instantiated:

// main.js 
export function main() { 
  const saturnV = new InactiveRocket('Saturn V'); 
  console.log(saturnV.name, ' is a Rocket ', saturnV instanceof 
  Rocket); 
 
  const falconHeavy = new ActiveRocket('Falcon Heavy'); 
  console.log(falconHeavy.name, ' is a Rocket ', falconHeavy 
  instanceof Rocket); 
 
  // throws an error; 
  new Rocket('Not going to make it!'); 
} 

7. Start your Python web server and open the following link in your browser:
   http://localhost:8000/.

8. You should see output like the following: