Optional Chaining: The ?. Operator in TypeScript

TypeScript 3.7 added support for the ?. operator, also known as the optional chaining operator. We can use optional chaining to descend into an object whose properties potentially hold the values null or undefined without writing any null checks for intermediate properties. Optional chaining is not a feature specific to TypeScript. The ?. operator got added to the ECMAScript standard as part of ES

[jay-es]

Optional Chaining `?.` はよく使うけど、`?.[]` `?.()`は書き方を忘れがち