Why can’t for-of be applied to iterators?

Axel Rauschmayer axel at rauschma.de
Sat Jun 8 22:34:23 PDT 2013

I can’t find the rationale as to why that isn’t allowed. Is it because iterators can’t be recognized as safely as iterables?

If we did enable for-of (and Array.from) for iterators, we would get two advantages:

- Generators would not need to have a method @@iterator.
- Many functions actually return iterators, but have to turn them into iterables (by adding a method @@iterator that returns `this`) to work with for-of.


Dr. Axel Rauschmayer
axel at rauschma.de

home: rauschma.de
twitter: twitter.com/rauschma
blog: 2ality.com

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