Use Optional Chaining for Nested Properties

Problem

Accessing deeply nested object properties requires multiple null/undefined checks.

Solution

Use optional chaining (?.) to safely access nested properties without explicit null checks.

Benefit

Eliminates 90% of null checking code and prevents "Cannot read property" errors.

Code Example

// Instead of:
const city = user && user.address && user.address.city;

// Use:
const city = user?.address?.city;