Optional Chaining
/ˈɒpʃənəl ˈtʃeɪnɪŋ/
Definition
The ?. operator that short-circuits and returns undefined instead of throwing when accessing a property of null/undefined.
Example in context
"user?.address?.city returns undefined safely if user or address is null — no TypeError crash."
Related terms
Practice this term
Master Optional Chaining in context by working through exercises in the JavaScript & TypeScript module. You'll see the term used in real engineering scenarios with multiple-choice, fill-in-the-blank, and matching drills.