[swift-users] Dictionary with optional values

[Jens Alfke]

> On May 18, 2016, at 7:35 PM, Nathan Day <nathan_day at mac.com> wrote:
> 
> In objective-c I have come across something like this a lot where a NSDictionary has been created from JSON an a NSNull is used to represent an actual null in the source JSON versus the absence of the key

Yeah, this comes from JavaScript, which weirdly has both ‘null’ and ‘undefined’ values; they’re kind of similar but not the same, and the latter is more like what we think of as null/nil in Swift or Obj-C. I think this was a bad design, and unfortunately it crept into JSON, which was based on JavaScript literals.

—Jens
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