[swift-evolution] SE-0105: Removing Where Clauses from For-In Loops

Russ Bishop xenadu at gmail.com
Sun Jun 26 17:47:32 CDT 2016

> On Jun 23, 2016, at 7:14 PM, Erica Sadun via swift-evolution <swift-evolution at swift.org> wrote:
>> On Jun 23, 2016, at 7:34 PM, William Shipley via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> I’m against removing “where" from “for/in”. I use it in my code and I think it aids readability quite a bit. In the example:
>> for x in theArray where x % 2 == 1 { print (x) }
> I have used odd-even examples a lot when presenting this concept, and inevitably the response
> is "Whoa, that's cool". What I'm missing are more challenging real-world use-cases to justify 
> the construct, and an exploration of why the challenging cases would not need debugger 
> support at that point.
> My concern (and I am happy to be corrected) is that any code that becomes slightly more 
> complex loses the beauty and readability and hinders debugging at the same time.
> — E

Here are two that are shipping right now. 

for (key, tile) in self._cache where tile.tintColor != self.tintColor { }

for innerArray in actualValue where innerArray.contains(expectedElement) { }

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