{"ScriptPreparationCode":"var arr = new Array(15000);\r\narr.fill({ id: 0 });\r\narr = arr.map((el, idx) =\u003E el.id = idx);\r\nvar foo = Math.floor(Math.random() * 15000);","TestCases":[{"Name":"findIndex","Code":"const userIdx = arr.findIndex(user =\u003E user.id === foo);","IsDeferred":false},{"Name":"map \u0026\u0026 indexOf","Code":"const userIdx = arr.map(user =\u003E user.id).indexOf(foo);","IsDeferred":false}]}