> On 6 Apr 2017, at 16:29, Ricardo Parada via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> Another thought on the use of single quotes (an possibly the proposed escape
> character). Do you think the closing single quote could be made optional
> since key paths cannot have spaces? Or would that be confusing for beginners?
Key paths can (probably) have spaces:
Welcome to Apple Swift version 3.1 (swiftlang-802.0.48 clang-802.0.48).
1> Double.nan.isNaN
$R0: Bool = true
2> Double . nan . isNaN
$R1: Bool = true
3> Double .nan .isNaN
$R2: Bool = true
4> Double. nan. isNaN
error: extraneous whitespace after '.' is not permitted
Double. nan. isNaN
^~
> For example, these two would be equivalent:
>
> let isPuppyPredicate = 'Pet.type == .dog && 'Pet.age < 12
> let isPuppyPredicate = 'Pet.type' == .dog && 'Pet.age' < 12
>
> Or this:
>
> let isPuppyPredicate = \Pet.type == .dog && \Pet.age < 12
> let isPuppyPredicate = \Pet.type\ == .dog && \Pet.age\ < 12
>
> You would use the closing character normally when wanting to invoke a method
> on the key path object.
>
> Any thoughts?
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