Brendan Eich wrote:
Erik Arvidsson wrote:
We really need to be able to do for-of with arrays and node lists
etc, without having to call .values() on it. It is such a common
operation that we should not tax this further.
Agreed. Consider Peter Norvig's Sudoku solver, which I ported to JS1.7
years ago, ported to ES6:
https://gist.github.com/anonymous/5753636
Better version at
https://gist.github.com/BrendanEich/5753666
(Stripped __iterator__ left-overs from JS1.7 era -- hooray for iterable
Arrays in ES6!)
/be
This code is nearly as concise as the Python original. Requiring
values() calls all over does no one any favors.
The idea that iterators return themselves from their @@iterator
(__iter__) hook has years of actual programmer mileage in Python. I
take that experience seriously, compared to arguments from purity that
tax the common use-cases.
/be
On Mon, Jun 10, 2013 at 3:32 AM, Andy Wingo <[email protected]
<mailto:[email protected]>> wrote:
On Sun 09 Jun 2013 11:34, Jason Orendorff
<[email protected] <mailto:[email protected]>> writes:
> I think it's a mistake for iterators not to be iterable.
I agree, FWIW.
I think I would go farther and suggest that _only_ iterators be
iterable. That way, the RHS of a for-of is expected to be an
iterator.
In the worst case you end up having:
var a = [1, 2, 3, 4]
for (let x of values(a))
...
instead of
for (let x of a)
...
which to my eye is better anyway. Making an "itertools"-like
library
difficult is a definite drawback of the current spec.
Andy
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erik
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