ECMAScript Cookbook

How to do it...

1. Open your command-line application, and navigate to your workspace.
2. Create a new folder named 12-08-create-class-to-wrap-set.

3. Create a main.js file that defines a new class named Rocket that takes a constructor argument name and assigns it to an instance property:

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

4. Create a class RocketSet file that creates a new map and assigns it as an instance property in the constructor:

// main.js 
class RocketSet { 
  constructor () { 
    this.set = new WeakSet(); 
     }    
   } 

5. Add an add method that checks the type of the key and value arguments. This method should throw if the argument types are incorrect; otherwise, set the pair as an entry on the map:

// main.js class RocketSet ...