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

Charlie Monroe charlie at charliemonroe.net
Sun Jun 12 23:39:10 CDT 2016

> 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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