1. Open your command-line application and navigate to your workspace.
2. Create a new folder named 07-03-defining-methods.
3. Copy or create an index.html that loads and runs a main function from main.js.
4. Create a main.js with a class named Rocket, which assigns a name property upon construction:

// main.js 
class Rocket { 
  constructor(name) { 
    this.name = name; 
  } 
} 

5. Add a method named takeoff that accepts an option countdown argument. The body of the method should log a message before and after a timeout:

// main.js 
class Rocket { 
  // ... 
  takeOff(countdown = 1000) { 
    console.log(this.name + ' starting countdown.'); 
    setTimeout(() => { 
      console.log(`Blastoff! ${this.name} has taken off`); 
    }, countdown); 
  } 
} 

6. Add a main function that creates two instances and then calls their takeOff methods:

// main.js 
export function main() { 
  const saturnV = new Rocket('Saturn V'); 
  const falconHeavy = new Rocket('Falcon Heavy'); 
  saturnV.takeOff(500); 
  falconHeavy.takeOff(); 
}  

7. Start your Python web server and open the following link in your browser: 
   http://localhost:8000/.
8. You will see the following output: