Using optional chaining operator for object property access

Question

TypeScript 3.7 now supports the optional chaining operator. Hence, you can write code such as:

const value = a?.b?.c;

I.e., you can use thi

Answer 1

When accessing a property using bracket notation and optional chaining, you need to also have a dot in addition to the brackets:

const value = a?.[b]?.c;

This is the syntax that was adopted by the TC39 proposal, because otherwise it's hard for the parser to figure out if this ? is part of a ternary expression or part of optional chaining.