{"ScriptPreparationCode":"var itemCount = 10000\r\nvar items = new Array(itemCount)\r\n\r\nfor (var i = itemCount - 1; i \u003E= 0; i--) {\r\n items[i] = { id: i, data: 920501 }\r\n}","TestCases":[{"Name":"for in","Code":"let arr = []\r\nfor(let i in items){\r\n arr[i] = {...items[i], idx: i}\r\n}","IsDeferred":false},{"Name":"map","Code":"items.map((v,i)=\u003E({...v,idx:i}))","IsDeferred":false}]}