Prototypes and Object Delegation in JavaScript

Key Insight

JavaScript provides the unique capability to create objects directly and explicitly without the prerequisite of defining their structure within a class, differentiating it from many other languages. For numerous years, developers constructed the class design pattern on top of JavaScript's prototype system, a practice often referred to as 'prototypal inheritance,' and the introduction of the 'class' keyword in ES6 further solidified the language's inclination towards object-oriented and class-style programming paradigms.

However, an exclusive focus on classes tends to overshadow the inherent beauty and power of the underlying prototype system itself, which facilitates dynamic cooperation between two objects by allowing them to share a 'this' context during method execution. While classes undeniably represent one valid pattern built upon this foundational power, an alternative and distinct approach involves embracing objects purely as objects, foregoing the class construct, and instead enabling their cooperation directly through the prototype chain; this method is termed 'behavior delegation'.

Behavior delegation is argued to be a more powerful mechanism than traditional class inheritance for effectively organizing both behavior and data within programs. Despite its potential, delegation currently receives significantly less attention compared to class inheritance and functional programming approaches. Developers are encouraged to deeply explore behavior delegation, as it offers substantial potential and aligns more closely with JavaScript's native object model, presenting a compelling alternative to merely adopting class-based approaches.