Private data in objects is a trickier proposition in JavaScript than in most languages. Only the most recent spec (ES12) specifically addresses private data, so the way to hide it has until recently been to put it in a closure. … Continued
Cohesion and coupling are architectural concerns in the design of well-formed objects. Well-formed objects are cohesive and loosely coupled. Poor cohesion and tight coupling are design flaws, and are reasons to refactor a class architecture. (For an overview of object-oriented … Continued
Objects In general terms, objects are units of reusable software functionality. Different objects can be assembled together to become parts of software applications. Objects expose their functionality through properties and methods. Properties define, store and expose attributes, and methods define … Continued
Inheritance Inheritance is a core concept in object-oriented design. For an overview of object-oriented design, have a look at Object-Oriented Design Basics: Objects, Classes and Inheritance. Inheritance is the ability of one class (a “subclass”) to use the state and … Continued
What is Polymorphism? Polymorphism is the ability to represent different sets of data and different behaviors with a common interface. Typically, this means two classes that have the same methods but different implementations of those methods. A good analogy is … Continued