{"ScriptPreparationCode":"var arr = new Array(10000).fill(0).map(() =\u003E [1,2]);","TestCases":[{"Name":"reduce concating","Code":"console.log(arr.reduce((res,x) =\u003E [...res, x, x], []));","IsDeferred":false},{"Name":"flatMap concating","Code":"console.log(arr.flatMap(x =\u003E [x, x]));","IsDeferred":false}]}