This isn't limited to Optional. Any dictionary whose value type conforms to NilLiteralConvertible can be "vulnerable" to some pretty subtle bugs.
- Dave Sweeris > On May 18, 2016, at 13:16, Jens Alfke via swift-users <swift-users@swift.org> > wrote: > > (Thinking about it, I can’t see much use for a dictionary of optionals. > What’s the difference between “x has no value” and “x has a value of nil”? I > guess it’s that when you iterate the keys you see x. This seems like a tricky > use that could easily confuse someone reading the code (who could be you, a > year later!) Personally I’d prefer a different, clearer solution, unless this > was something performance-critical that led to faster code. In which case I’d > add lots of comments!) > > —Jens > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users _______________________________________________ swift-users mailing list swift-users@swift.org https://lists.swift.org/mailman/listinfo/swift-users
