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

[Jon Shier]

	As time goes on, I’m feeling more and more that these consistency proposals are sorely misguided. Frankly, unless the syntax is confusing or misleading, even once the developer has learned the guiding principles of Swift, consistency is not a good argument for change. This proposal is the perfect example of this. No one will find the use of “where” in loops confusing, aside from those who will wonder why it was removed from if statements. There is no misleading behavior or confusing syntax here. This is just consistency for consistency’s sake. Once this proposal is done, then another will be made to remove “where” from another place in the language. Then another and another until it’s gone completely and a very useful part of the language is removed in the name of consistency. Which really just comes down to “where” isn’t used here, so it can’t be used there anymore. It’s death by a thousand cuts.



Jon Shier
	 

> On Jun 9, 2016, at 1:16 PM, Erica Sadun via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
>> On Jun 9, 2016, at 11:11 AM, Charlie Monroe <charlie at charliemonroe.net> wrote:
>> See my latest post - included results with -Ofast. But still, using filter and lazy.filter is 10+% slower, which were the suggested alternatives to `where`.
>> 
>> 
> 
> I need to correct this misapprehension.
> My suggested alternative to where was and remains `guard`.
> 
> -- E
> 
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