ECMAScript Cookbook

How to do it...

1. Open your command line application and navigate to your workspace.
2. Create a new folder named 08-04-checking-with-instanceof.
3. Copy or create an index.html that loads and runs a main function from main.js.
4. Create two objects rocketMap and inactiveRocketMap:

// main.js 
let rocketMap = {};  
let inactiveRocketMap = {}; 

5. Define a new class named Rocket. Add a constructor. Use the name to assign the instance to the rocketMap and define a simple print method:

// main.js 
class Rocket { 
  constructor(name) { 
    this.name = name; 
    rocketMap[name] = this; 
     } 
  print() { 
    console.log(this.name + ' is a rocket'); 
  } 
}  

6. Add a static find method that retrieves an instance from the rocketMap:

// main.js class Rocket { static find (name) { return ...