{"ScriptPreparationCode":"var a = new Array(1000);\r\na.fill([1,2,3,4]);\r\n\r\nvar ia = Immutable.List(a);","TestCases":[{"Name":"native","Code":"a.shift();\r\na.push([1,2,3,4]);","IsDeferred":false},{"Name":"immutable array push ","Code":"ia = ia.push([1,2,3,4]);\r\n/*var pia = ia.withMutations(function(mat){\r\n mat.shift();\r\n mat.push([1,2,3,4]);\r\n});\r\n\r\nvar nia = pia.toArray(); */","IsDeferred":false}]}