{"ScriptPreparationCode":"var obj = {};\r\n for ( var i = 0; i \u003C 1000; i\u002B\u002B ) {\r\n obj[i] = i;\r\n }","TestCases":[{"Name":"1","Code":"const exist = 999 in obj;","IsDeferred":false},{"Name":"2","Code":"const exist2 = !!obj[999];","IsDeferred":false}]}