JavaScript Recursion

What is Recursion?

Function calls itself:

```javascript function factorial(n) { if (n === 1) return 1; return n * factorial(n - 1); } ```

Base Case

Always need stopping condition:

```javascript if (n === 1) return 1; // Base case ```

Key Takeaway

Recursion calls itself. Need base case to stop. Useful for tree traversal and algorithms.