{"ScriptPreparationCode":"var arr = Array(10_000).fill(0)","TestCases":[{"Name":"reduce with concat","Code":"let result = new Array(arr.length * 2);\r\narr.reduce((acc, x) =\u003E { result.push(x, x); return result; }, result)","IsDeferred":false},{"Name":"flatMap","Code":"arr.flatMap(x =\u003E [x, x])","IsDeferred":false}]}