Yes, this will be familiar to people creating objects or classes that are intended to represent iterable collections. You do the same dynamic key syntax with a class declaration or object literal, but use `Symbol.iterator` as the well-known symbol for the method.
https://www.samanthaming.com/tidbits/37-dynamic-property-nam...
Also in the example is method shorthand:
https://www.samanthaming.com/tidbits/5-concise-method-syntax...
Since symbols cannot be referred to by strings, you can combine the two.
Basically, there isn't any new syntax here.