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In JavaScript, objects are collections of key-value pairs used to represent entities with properties and behaviors: let user = { name: "Chaoyang", greet() { console.log("Hello!"); } }; Memory Representation Objects are stored in heap memory. Variables hold references (memory addresses) to these heap-allocated obje ...

Instantiating classes directly via constructors often couples client code tightly with concrete implementation details. This friction becomes pronounced when objects require multi-step configuration, validation, or conditional setup based on runtime parameters. Instead of scattering initialization logic across multiple consumer classes, central ...

Constructor Execution Steps When a constructor function is invoked with the new keyword, the following steps occur: A new empty object is created in memory. The [[Prototype]] of that new object is linked to the constructor's prototype property. The this binding inside the constructor is set to the newly created object. The constructor's code e ...

Limitations of Simple Factory Pattern The Simple Factory pattern successfully separates object creation from business logic, but it violates the Open-Closed Principle. This principle states that software entities should be open for extension but closed for modification. Consider a scenario where you need to add a new monster type called Beast. ...

JavaScript allows developers to define custom objects beyond built - in methods and classes. There are three primary syntaxes for creating custom objects: 1. Using the Built - in Object Constructor To create an object with the system - provided Object constructor, you can do the following: // Instantiate an object let user = new Object(); // Ad ...