When found, the inout(JSONValue)* that matches to the key, otherwise null.
JSONException if the right hand side argument JSONType is not object.
JSONValue j = [ "language": "D", "author": "walter" ]; string a = ("author" in j).str; *("author" in j) = "Walter"; assert(j["author"].str == "Walter");
Provides support for the in operator.
Tests whether a key can be found in an object.