{"ScriptPreparationCode":"var arr = [];\r\nvar obj = {};\r\nfor (let i = 0; i \u003C 10000; i\u002B\u002B) {\r\n\tconst id = \u0060id-${i}\u0060;\r\n\tarr.push({ id });\r\n\tobj[id] = { id };\r\n}\r\nconst r = Math.floor(Math.random() * 10000);\r\nvar search_id = \u0060id-${r}\u0060;","TestCases":[{"Name":"in operator","Code":"const hasItem = search_id in obj;","IsDeferred":false},{"Name":"findIndex method","Code":"const hasItem = arr.findIndex(it =\u003E it.id === search_id) \u003E -1;","IsDeferred":false}]}