Assembling customized instances with builders

The previous recipe shows how to organize the operations of a class. Sometimes, object initialization can also be complicated. In these situations, it can be useful to take advantage of another design pattern: builders.

In this recipe, we'll see how to use builders to organize the initialization of more complicated objects.

Getting ready

This recipe assumes you already have a workspace that allows you to create and run ES modules in your browser. If you don't, please see the first two chapters.

How to do it...

1. Open your command-line application and navigate to your workspace.
2. Create a new folder named 09-02-assembling-instances-with-builders.

3. Create a main.js file that defines a new class named Mission, which that takes a name constructor argument and assigns it to an instance property. Also, create a describe method that prints out some details:

// main.js 
class Mission { 
  constructor (name) { 
    this.name = name; 
  } 
 
  describe () { 
    console...