JavaScript Nullish Coalescing

The Problem with ||

`||` treats 0, '', false as falsy:

```javascript const count = 0; const result = count || 10; // 10 (wrong! count is 0, not missing) ```

The Solution: ??

```javascript const count = 0; const result = count ?? 10; // 0 (correct!) ```

**Only uses default for null/undefined.**

Key Takeaway

Nullish coalescing (??) provides defaults only for null/undefined. Better than || for numbers and strings.