On 19/03/2019 20:24, Levi Morrison wrote:
Today in the Dart world, Bob Nystrom published an article called
[Making Dart a Better Language for UI][1]. I think it's an incredibly
relevant article, since it is essentially about comprehensions, why
they are a thing, as well as some of the design choices they made.
I think everyone in this thread ought to spend the 10-15 minutes reading it.
[1]:
https://medium.com/dartlang/making-dart-a-better-language-for-ui-f1ccaf9f546c
Hi Levi,
That is indeed a very interesting article, thanks for sharing.
The idea of foreach and if just being available whenever you're
specifying an array is a really interesting version of this construct.
The mention of the spread operator has actually given me a different
idea, related to iterator_to_array. What if the "..." operator could
spread any iterable, not just arrays as currently proposed in an RFC [1]?
$iterator = new SomethingIterator;
$array = [ ...$iterator ];
$array2 = [ ...someGenerator() ];
That plus the current comprehension proposal would give us this:
$array = [ ...[ foreach $list as $x if $x % 2 yield $x*2] ];
Which could fairly naturally be special cased to this:
$array = [ ... foreach $list as $x if $x % 2 yield $x*2 ];
This would give us concise syntax for both iterator and array forms, in
a way that fits the rest of the language better than () vs [].
[1]: https://wiki.php.net/rfc/spread_operator_for_array
--
Rowan Collins
[IMSoP]
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