JavaScript Nullish Coalescing

The Problem with ||

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

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

The Solution: ??

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.