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

Erica Sadun erica at ericasadun.com
Thu Jun 23 21:14:48 CDT 2016

> On Jun 23, 2016, at 7:34 PM, William Shipley via swift-evolution <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

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