In ES5 there is a concept of array-like, which while probably too relaxed is
really friendly for developers, as we can easily create custom array-like
abstractions and make it consumable to any generic functions, methods that
process array-likes.
In ES6 there's more advanced (and definitely better) iterators concept,
while I'm pretty excited by it, If read spec correctly I see it's quite
limited and not that usable.
There's no way I can create custom iterator abstraction (How can I can
define MyCustomIterator.prototype[@@iterator] method?).
There's no straightforward way to consume iterators in generic way, e.g.
I want to write function that works in similar way as Set constructor, and
accepts any iterator implementation. I don't have a means to call
iterator[@@iterator] method.
Please correct me if I'm wrong, but if it's the case, I think it's really
important to open that.
Maybe there should be Reflect.getIterator(obj) and
Reflect.defineIterator(obj, getIterator) for that?
In ES5 there is a concept of array-like, which while probably too relaxed is
really friendly for developers, as we can easily create custom array-like
abstractions and make it consumable to any generic functions, methods that
process array-likes.
In ES6 there's more advanced (and definitely better) iterators concept,
while I'm pretty excited by it, If read spec correctly I see it's quite
limited and not that usable.
1 There's no way I can create custom iterator abstraction (How can I can
define MyCustomIterator.prototype[@@iterator] method?).
2. There's no straightforward way to consume iterators in generic way, e.g.
I want to write function that works in similar way as Set constructor, and
accepts any iterator implementation. I don't have a means to call
iterator[@@iterator] method.
Please correct me if I'm wrong, but if it's the case, I think it's really
important to open that.
Maybe there should be Reflect.getIterator(obj) and
Reflect.defineIterator(obj, getIterator) for that?
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There will be a public symbol (that you can import from a system module) that will allow you to do both things.
> 1 There's no way I can create custom iterator abstraction (How can I can
> define MyCustomIterator.prototype[@@iterator] method?).
>
> 2. There's no straightforward way to consume iterators in generic way, e.g.
> I want to write function that works in similar way as Set constructor, and
> accepts any iterator implementation. I don't have a means to call
> iterator[@@iterator] method.
>
> Please correct me if I'm wrong, but if it's the case, I think it's really
> important to open that.
>
> Maybe there should be Reflect.getIterator(obj) and
> Reflect.defineIterator(obj, getIterator) for that?
There will be a public symbol (that you can import from a system module) that will allow you to do both things.
--
Dr. Axel Rauschmayer
axel at rauschma.de
home: rauschma.de
twitter: twitter.com/rauschma
blog: 2ality.com
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> There will be a public symbol (that you can import from a system module)
that will allow you to do both things.
There's no problem then. Thanks
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View this message in context: http://mozilla.6506.n7.nabble.com/Creating-and-consuming-custom-iterators-tp289598p289600.html
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In ES5 there is a concept of array-like, which while probably too relaxed is really friendly for developers, as we can easily create custom array-like abstractions and make it consumable to any generic functions, methods that process array-likes.
In ES6 there's more advanced (and definitely better) iterators concept, while I'm pretty excited by it, If read spec correctly I see it's quite limited and not that usable.
There's no way I can create custom iterator abstraction (How can I can define
MyCustomIterator.prototype[@@iterator]method?).There's no straightforward way to consume iterators in generic way, e.g. I want to write function that works in similar way as Set constructor, and accepts any iterator implementation. I don't have a means to call
iterator[@@iterator]method.Please correct me if I'm wrong, but if it's the case, I think it's really important to open that.
Maybe there should be
Reflect.getIterator(obj)andReflect.defineIterator(obj, getIterator)for that?