What design patterns do you know and have used in your work?

Some common design patterns frequently used in frontend development:

• Module Pattern — allows encapsulating code by creating private and public parts, helping to avoid polluting the global namespace.
• Observer — used to implement reactivity, where a change in an object's state automatically notifies subscribers. For example, in React or Vue.
• Component Pattern — a basic pattern for building UI from independent, reusable parts.
• Factory — for creating objects with a defined interface without specifying a particular class.

In my practice, I often used the module pattern for organizing code and a component approach when working with React.