In this post I’ll show three different techniques for encapsulating internal state in JavaScript, concluding with my preferred approach, a pattern I’m calling “Symbol-keyed State Accessor”. I was in a discussion about how to implement the Value Object pattern in JavaScript recently. Most of the examples folks were proposing involved a prototypical approach to OOO, using either class or prototype to create a Value Object type, and managing the object’s internal state via this. Here...
