⚡ Understanding React Keys: Why They Matter in Lists

When rendering lists in React, you’ll often see a warning about missing keys. But why are keys so important? 🤔

📌 Example without key:

{items.map((item) => (
  <li>{item}</li>
))}

❌ React struggles to identify which item changed, added, or removed.
📌 Example with key:

{items.map((item) => (
  <li key={item.id}>{item.name}</li>
))}

✅ React can track each element efficiently.

✨ Key Points:
• Keys help React optimize re-rendering.
• Always use a unique identifier (like id).
• Avoid using index as key, unless items never change order.

Think of keys as React’s way of labeling items so it knows what’s what during updates. 🚀