Assign an object property using optional chaining?

Let's assume that you have the following object:

javascript
let erik = { age: 31 }

You can't use the optional chaining operator to create/modify a new variable:

javascript
// ❌ Uncaught SyntaxError: Invalid left-hand side in assignment
erik.location?.city = 'Barcelona'

But you can do the following:

javascript
erik.location = erik.location || {}
erik.location.city = 'Barcelona'