ECMAScript Cookbook

How to do it...

1. Open your command-line application, and navigate to your workspace.
2. Create a new folder named 12-03-add-remove-from-weak-set.
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 that takes a constructor argument name and assigns it to an instance property:

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

5. Create a main function with some Rocket instances and a WeakMap instance. Add and remove the instances from the set:

// main.js export function main() {const saturnV = new Rocket('US: Saturn V');const falconHeavy = new Rocket('US: Falcon Heavy');const rocketSet = new WeakSet();rocketSet.add(saturnV);rocketSet.add(saturnV); ...