A reprieve for ES6 comprehensions
brendan at mozilla.org
Sat Jun 7 15:41:11 PDT 2014
Tab Atkins Jr. wrote:
> On Fri, Jun 6, 2014 at 1:57 PM, Andy Wingo<wingo at igalia.com> wrote:
>> > 1: Essential differences
>> > ==
>> > Array comprehensions are eager. Generator comprehensions are lazy.
>> > Array comprehensions desugar into a do expression à la ES7. Generator
>> > comprehensions desugar into an IIGFE (immediately-invoked generator
>> > function expression) -- sorta, anyway. (Generator function desugaring
>> > is not exact due to arguments/this/etc scoping and properties on the
>> > generator function.)
>> > This is an essential difference in the use of the iterator, and so it
>> > makes sense to distinguish these at the source level as well.
> I'm not sure I understand. Is this an argument against Python's use
> of similar syntaxes as well? That is, do you also disagree with
> Python's high similarity between array comprehensions and generator
No, the problem is there's no way to do a generator comprehension in
(what we saw of) the new syntax.
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