> 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.

Weird. My own Swift projects (not on Github :P) use “where” all the time with 
for loops. I really like it and think it reads *and* writes far better as well 
as makes for nicer one-liners. In one project, by rough count, I have about 20 
that use “where” vs. 40 in that same project not using “where”.

In another smaller test project, there are only 10 for loops, but even so one 
still managed to use where.

Not a lot of data without looking at even more projects, I admit, but this 
seems to suggest that the usage of “where” is going to be very 
developer-dependent. Perhaps there’s some factor of prior background at work 
here? (I’ve done a lot of SQL in another life, for example.)

I feel like “where” is a more declarative construct and that we should be 
encouraging that way of thinking in general. When using it, it feels like 
“magic” for some reason - even though there’s nothing special about it. It 
feels like I’ve made the language work *for me* a little bit rather than me 
having to contort my solution to the will of the language. This may be highly 
subjective.

l8r
Sean

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