Behavioral Patterns

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1. 1 What is the Observer pattern, and how do event emitters and reactivity build on it? Medium
2. 2 What is the Pub/Sub pattern, and how does it differ from a plain Observer? Medium
3. 3 How does the Strategy pattern remove big conditional blocks — give a UI example? Medium
4. 4 What is the Command pattern, and how does it enable undo/redo? Hard
5. 5 What is the State pattern, and how does it model a component with many modes cleanly? Medium
6. 6 How does the Iterator pattern relate to JS iterables and generators? Medium