Specify support for index access

[ArashMotamedi]

I'd like to suggest that the nullish-coalescing operator also be usable for index access:

let person = { name: "John" }
let cityLength = person.address?["city"]?.length

let repo = { 
   name: "myrepo",
   // commits: [{ date: "2017/12/01" }, {date: "2017/12/02"}]
 }
let firstCommitDate = repo.commits?[0]?.date;

[tvald]

I think you want the optional-chaining proposal. It already encompasses dynamic property access.

[ArashMotamedi]

@tvald Yes! Thanks! Perils of creating an issue way too late at night!