[swift-evolution] Extending the for loop to have multiple clauses

[Jacob Bandes-Storch]

Are you expecting that this could be combined with "where" clauses?

for x in range1 where x%2==0, y in range2 where y%3==0 {}

for x in range1, y in range2 where x%2==0 && y%3==0 {}

I think it's a good idea, but the implications may be less than obvious.
On Wed, Dec 9, 2015 at 12:37 PM krzysztof at siejkowski.net via
swift-evolution <swift-evolution at swift.org> wrote:

> +1. Way more readable than nested loops and consistent with already
> existing syntax.
>
>
> -----Original Message-----
> From: Chris Eidhof via swift-evolution <swift-evolution at swift.org>
> Reply: Chris Eidhof <chris at eidhof.nl>
> Date: December 9, 2015 at 9:00:26 PM
> To: swift-evolution at swift.org <swift-evolution at swift.org>
> Subject:  [swift-evolution] Extending the for loop to have multiple clauses
>
> > I think it could be really nice to extend the for-loop so that it can
> have multiple clauses.
> > Much like in the if-let with multiple clauses, I could imagine a
> for-loop with multiple
> > clauses:
> >
> > var cards: [(Suit,Rank)] = []
> > for x in suits, y in ranks {
> > cards.append((x,y))
> > }
> >
> > This would be the same as writing:
> >
> > var cards: [(Suit,Rank)] = []
> > for x in suits {
> > for y in ranks {
> > cards.append((x,y))}
> > }
> > }
> >
> > You could also do something like:
> >
> > for x in input1, y in (x..> // Do something with (x,y)
> > }
> >
> > In fact, once we would have that, we could combine both if-let and for,
> and make it more
> > general, to end up with something like Haskell’s do-notation or C#’s
> LINQ. But that might
> > be taking it too far...
> >
> > Chris
> > _______________________________________________
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> > swift-evolution at swift.org
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> >
>
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