Missing Values: null, undefined, ?. and ??

Real data has holes, so learn the difference between undefined and null, read a property that might be missing with ?., and give a missing value a default with ?? instead of ||.

Updated

Cheat sheet: Missing Values: null, undefined, ?. and ??
Category
JavaScript
Level
Apprentice
Tags
JavaScript, null (javascript), Nullish Coalescing (javascript), Optional Chaining (javascript), undefined (javascript)