instantiating generators

Brendan Eich brendan at mozilla.com
Fri Mar 15 13:36:47 PDT 2013


Tab Atkins Jr. wrote:
> On Fri, Mar 15, 2013 at 11:51 AM, Allen Wirfs-Brock
> <allen at wirfs-brock.com>  wrote:
>> On Mar 15, 2013, at 11:22 AM, Axel Rauschmayer wrote:
>>> I would prefer having to use `new` (but don’t have strong feelings about
>>> it): generators are more like constructors than like functions. When I first
>>> started experimenting with them in Firefox, it took me a while to figure
>>> that out (even though it is obvious in hindsight). With `new`, I’d probably
>>> have figured it out quicker.
>> My experience was similar.
>
> Mine's the opposite - my experience with generators in Python built up
> a strong and very natural-feeling intuition that a generator was just
> a function that returned a "magic list".  Trying to push that into a
> constructor notion would feel awkward.
>
> Actually using it would be even more awkward than thinking about it, I
> believe.  For example, I use the enumerate() generator *all the time*
> in Python.  Having to always write:
>
>      for(x of new enumerate(seq)) {...}
>
> would feel really weird, even if you changed the conjugation of the
> function to "enumeration()".

Don't worry, we are not going to require 'new'.

/be


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