ECMAScript Cookbook

How to do it...

1. Open your command-line application and navigate to your workspace.
2. Create a new folder named 09-01-defining-steps-with-template-functions.
3. Copy or create an index.html file that loads and runs a main function from main.js.
4. Create a main.js file that defines a new abstract class named Mission:

// main.js 
class Mission { 
  constructor () { 
    if (this.constructor === Mission) { 
      throw new Error('Mission is an abstract class, must       extend'); 
    } 
  } 
}  

5. Add a function named execute that calls three instance methods—determineDestination, determinPayload, and launch:

// main.js 
class Mission { 
  execute () { 
    this.determinDestination(); 
    this.determinePayload(); 
    this.launch(); 
  } 
} 

6. Create a LunarRover class that extends the Mission class: ...