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You see classes in OOP. You also see factory functions in JavaScript. Why do we use both?
Think about needing 100 user objects. You write the name and email for every single one. You add a method to update the email. You repeat this 100 times. This wastes time. It leads to mistakes.
Factory functions solve this. A factory function creates and returns an object. You write the structure once. You call the function to get a new object.
Benefits of factory functions:
- Your objects stay consistent.
- You avoid missing fields.
- You protect data.
You hide internal state with a closure. Other parts of your app do not change the data directly. This keeps your data safe.
So why use classes? Classes solve a different problem. They organize complex systems.
Think about a big store app. You have products, orders, and shipments. These pieces relate to each other. Classes provide a blueprint. They help you model these relationships.
The choice is simple:
- Use factory functions for simple object creation.
- Use classes for large, complex systems.
Good design is about trade-offs. Pick the tool for your specific problem.
Next, I will discuss Encapsulation.