On May 13, 2013, at 9:44 PM, Brendan Eich wrote:
> David Herman wrote:
>> On May 13, 2013, at 6:11 PM, Brendan Eich<[email protected]> wrote:
>>
>>> Merge next and send by letting next take an optional parameter? Ok by me.
>>
>> +1
>
> I pointed out to Dave that Python has arity checking and did next before
> adding send in 2.5 for "coroutines", whereas JS has optional params without
> arity checking, so folding send into next works.
>
>>> Make yield* work on any {next, throw}, not necessary but ok by me too.
>>
>> Yes with one delta: if there's no .throw it still works, it just defaults to
>> (x) => { throw x }. This way you can write ordinary iterators without
>> having to worry about providing the default throw, and they still function
>> properly as generators.
>
> +1 or more -- we should not invent new nominal types with stub throw method
> implementations, people will not use them and they are unnecessary
> boilerplate.
>
> /be
>
All sounds fine with me and I've updated the draft accordingly.
What about providing a convenience "resume" method on generators to help
clarify co-routine style usage? Dave suggested that "resume" was pedagogically
useful.
I would define it equivalently two:
resume(...args) {return this.next(...args};
(resume rather than next delegates to avoid the delegation for normal for-of
iterations)
Allen
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