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

[Xiaodi Wu]

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> 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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