yield*, strings

[sebmck]

Currently it's not possible to yield non-objects such as primitives etc due to the use of in in the runtime. May be necessary to just use Object.prototype.hasOwnProperty.

For example the following taken from compat-table wont work:

var iterator = (function* generator() {
  yield* "56";
}());
var item = iterator.next();
var passed = item.value === "5" && item.done === false;
item = iterator.next();
passed    &= item.value === "6" && item.done === false;
item = iterator.next();
passed    &= item.value === undefined && item.done === true;
return passed;

[benjamn]

Hmm, but String.prototype is where the Symbol.iterator property lives, so Object.prototype.hasOwnProperty("asdf", Symbol.iterator) will be false. And that's true for most iterable objects.

It might work to fall through to the case that uses .length to synthesize an iterator object, but I'd really prefer to use iterable[Symbol.iterator]() when it's available.

Perhaps we can just test that iterable[Symbol.iterator] !== undefined.

[sebmck]

@benjamn Ah right, duh. I misinterpreted the use of in in this case.