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//map native method testing

var test = [1, 2, 3, 4, 5, 6, 7];
var i = 10000;
var fn = function(){return arguments[0];};
console.time("map");
while(i--){
  var newarr = test.map(function(){return arguments[0];});
}
console.timeEnd("map");
//map: 19ms