Mastering Design Patterns in JavaScript: Part 3 — The Observer Pattern 👀
Welcome back to our exploration of design patterns in JavaScript! In the previous parts of this series, we examined the Singleton and Factory patterns. Today, we will delve into the Observer Pattern — an essential tool for building scalable and maintainable applications from a backend developer’s perspective.
Understanding the Observer Pattern 🧐
Imagine you’re waiting for a parcel delivery. You don’t stand by the door all day; instead, you rely on notifications — maybe a text or an email — to let you know when it’s arriving. This way, you can go about your day and only respond when there’s something worth your attention.
In the programming world, the Observer Pattern works much the same way. It’s a behavioural design pattern that allows objects (observers) to subscribe to events or changes in another object (the subject). When the subject changes, it notifies all its observers, keeping everything in sync without tight coupling.
Why is this cool? Because it lets different parts of your application communicate without needing to know the inner workings of each other. It’s like having a well-organized group chat where everyone gets updates without unnecessary chatter.
