> On May 18, 2016, at 3:56 AM, Artyom Goncharov via swift-users
> <swift-users@swift.org> wrote:
>
> var noOptDict = ["one": 1, "two": 2, "three": 3 ]
> noOptDict["one"] = nil
Wow, interesting. To me this was surprising behavior too.
The comment for Dictionary subscript says:
/// Access the value associated with the given key.
///
/// Reading a key that is not present in `self` yields `nil`.
/// Writing `nil` as the value for a given key erases that key from
/// `self`.
Which is exactly what it is doing. As the Zhaoxin said, you can use
updateValue (and removeValueForKey) to get better results when dealing with
optional dictionary values.
Ray
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