[swift-evolution] Change `repeat` to loop indefinitely if no while clause is present

Austin Zheng austinzheng at gmail.com
Tue May 10 15:10:05 CDT 2016

Agreed. I'm not convinced that this actually prevents any more errors than
it might cause (forgot to finish writing my "repeat" block, and now my app
is unresponsive), and I don't think there's enough of an expressivity win
to add another keyword.


On Tue, May 10, 2016 at 1:04 PM, Haravikk via swift-evolution <
swift-evolution at swift.org> wrote:

> On 10 May 2016, at 08:27, Nicholas Maccharoli via swift-evolution <
> swift-evolution at swift.org> wrote:
> But I think it might be best to change the syntax / behaviour of `repeat`
> to loop
> indefinitely if no trailing while clause is present:
>     repeat {
>         if ... { break }
>         //...
>     }
> -1 from me on both counts; the thing I like about while true is that it’s
> explicit about what I meant, whereas a repeat block with no while clause is
> indistinguishable from me forgetting to include one, or me wanting an
> infinite loop.
> An alternative could be to add a new “forever” keyword or something
> similar, replacing while true wherever applicable, but personally I don’t
> think it’s that important.
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