I can't believe this !!

[anonymous via Digitalmars-d-learn]

On 14.11.2015 07:30, MesmerizedInTheMorning wrote:
> https://issues.dlang.org/show_bug.cgi?id=15331
>
> but it's true !
>
> There's **nothing** to check the availability of a Key. At least I would
> expect opIndex[string key] to return a JSONValue with .type ==
> JSON_TYPE.NULL, but no...
>
> Also If it was returning a JSONValue* it would be easyer to check if a
> key is present.
>
> God damn it, how could you miss this design flaw when std.json was
> reviewed ?!

JSONValue supports `in`, though:
----
import std.stdio;
import std.json;
void main()
{
     foreach (jsonStr; ["{}", "{\"foo\": 42}"])
     {
         JSONValue jsonObj = parseJSON(jsonStr);
         const JSONValue* p = "foo" in jsonObj;
         if (p is null) writeln("not found");
         else writeln(*p);
     }
}
----

Looks like documentation has been neglected.