[swift-evolution] [Review] SE-0099: Restructuring Condition Clauses

Thorsten Seitz tseitz42 at icloud.com
Sun May 29 10:15:32 CDT 2016

Totally agree with Brandon. I don’t think that behavior is inconsistent.


> Am 28.05.2016 um 22:18 schrieb Brandon Knope via swift-evolution <swift-evolution at swift.org>:
> Doesn't this contextually make sense though?
> for, when read:
> "for each value in collection where some condition is met" do this loop
> while, when read:
> "while some condition where this constraint is met" do this loop 
> It could just be because I know the behavior and am use to it, but I think it makes sense contextually when used. 
> Brandon 
> On May 28, 2016, at 4:06 PM, Xiaodi Wu via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> I'm just gotta quote from Advanced Swift:
>> Note that the where clause [in a for loop] does not work like the where clause in a while loop. In a while loop, iteration stops once the value is false, whereas in a for 
>> loop, it functions like filter. 
>> On Sat, May 28, 2016 at 16:00 Haravikk <swift-evolution at haravikk.me <mailto:swift-evolution at haravikk.me>> wrote:
>> > On 28 May 2016, at 20:21, Xiaodi Wu <xiaodi.wu at gmail.com <mailto:xiaodi.wu at gmail.com>> wrote:
>> >
>> > There's already an inconsistency in where clause behavior for `if` and `while` versus `for` loops. It's nice IMO that the former uses are eliminated in this proposal.
>> Can you give an example? That sounds like something that should be addressed separately rather than just dropping it.
>> Like I say I really like using it for basic bind + condition cases, so I’m very much opposed to just tossing where clauses.
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