[swift-evolution] [DRAFT] Regularizing Where Grammar (was Re: Add a while clause to for loops)

[Erica Sadun]

> On Jun 9, 2016, at 1:57 PM, Haravikk <swift-evolution at haravikk.me> wrote:
> 
> I think the idea here is for a change from the first to the second of:
> 
> 	for eachValue in theValues where eachValue.isOdd { … }
> 	for eachValue where eachValue.isOdd in theValues { … }
> 
> I’m kind of split on this for a few reasons. The first is that it doesn’t ready quite as well plain like this, however I find it looks a bit better like:
> 
> 	for (eachValue where eachValue.isOdd) in theValues { … }


for eachValue where eachValue.isOdd in theValues { ... }
for case .Some(let value) where value > 5 in theValues { ... }

vs

for eachValue in theValues where eachValue.isOdd {...}
for case .Some(let value) in theValues where value > 5 { ... }

It should be parseable without parens.


> Just to clarify that what we’re looking for in theValues is “eachValue where eachValue.isOdd”, though I could probably learn to read it like this without parenthesis. That said, parenthesis lines up nicely with assignment of tuples like:
> 
> 	for (eachKey, eachValue where eachValue > 5) in theKeyValuePairs { … }

for (eachKey, eachValue) where eachValue > 5 in theKeyValuePairs {... }

The where clause is distinct from the pattern

-- E


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