map vs native for loop

JavaScript performance comparison

Revision 13 of this test case created by Ceane Lamerez

Info

test the performance of the jquery map versus a native for loop map

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script src="//underscorejs.org/underscore-min.js"></script>
<script>
Benchmark.prototype.setup = function() {
    testArray = new Array(100);
    for (var i = 0; i < 100; i++) {
      testArray[i] = i;
    }
    var o = function(arr, fn) {
        var lit = new Array(arr.length);
        for (var n = 0, lt = arr.length; n < lt; n++) {
          lit[n] = fn(arr[n]);
        }
        return lit;
        }
       
    opt = o;
   
    map = function(array, mapFunction) {
      var newArray = new Array(array.length);
      for (var i = 0; i < array.length; i++) {
        newArray[i] = mapFunction(array[i]);
      }
   
      return newArray;
    }
   
    double = function(x) {
      return x * 2;
    }
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jquery map
var result = $.map(testArray, double);
pending…
optimized loop map
var result = opt(testArray, double);
pending…
for loop map
var result = map(testArray, double);
pending…
Array.prototype.map
var result = testArray.map(double);
pending…
Underscore.map
var result = _.map(testArray, double)
pending…

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