Object-Oriented JavaScript – Functional Class Pattern

1. downside: memory overhead (duplicate methods for every instance)
2. benefit: clarity
3. downside: mutating closure variables + side effects

• lines 1 – 14: the constructor function
  • line 2: create an empty object
  • line 3: add an example ‘differentiator’ variable stored in closure
  • lines 5 – 11: add methods directly to empty object
  • line 13: return the new object

We can now create as many Example instances as we want, all with its own copy of each method. It is as simple as var example = Example();.