[swift-evolution] [Pitch] Retiring `where` from for-in loops

[Charlie Monroe]

if-continue. But I gladly took upon for-in-where as soon as I found out about it since it's more expressive and simply is less typing.

> On Jun 13, 2016, at 2:24 PM, Xiaodi Wu <xiaodi.wu at gmail.com> wrote:
> 
> What did you use before `where` existed?
> 
> On Mon, Jun 13, 2016 at 1:29 AM Charlie Monroe via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> And to follow-up to myself once again, I went to my "Cool 3rd Party Swift Repos" folder and did the same search. Among the 15 repos in that folder, a joint search returned about 650 hits on for-in (again with some false positives) and not a single for-in-while use.
>> 
> 
>> -- E
> 
> Not to undermine this fact, but I believe the fact that `where` can be used in a for loop is not widely known. I didn't know about it until about a month ago (haven't really read much docs, but most people don't either).
> 
> But after I found out about it, I started using it and it IMHO improved readability of my code. Not by much, but it's the little things that make you smile, right?
> 
> Many people here argument that `where` is a Swift speciality and needs to be learned by the developer - the alternative is to teach the person what's the proper alternative - that using .filter can have performance impact and that the *correct* way is to use guard within the for loop. And that's IMHO much worse than teaching a person about using `where` within a for loop.
> 
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