What you need to know
API data and optional settings may not contain every nested object. Optional chaining stops the access at a null or undefined value and returns undefined instead of crashing.
How to apply it
Use ?. only where absence is a legitimate state, then provide a thoughtful fallback at the point where the value is displayed or used. Validate required data at system boundaries.
Common mistake to avoid
Do not use optional chaining to hide a broken data contract. If a required field is missing, surface a useful error rather than silently rendering blank content.