function vs jquery extend vs object prototype

JavaScript performance comparison

Revision 8 of this test case created

Info

In FF3.6/Win, the execution part (the function calls) have nearly identical running times, so I included the function declarations themselves in the test cases.

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
function foo()
function aFoo() {
  var x;
  for (i = 0; i < 10; i++) {
    x = Math.random();
  }
}
aFoo();
pending…
var bar = function()
var aBar = function() {
    var x;
    for (i = 0; i < 10; i++) {
      x = Math.random();
    }
    };
aBar();
pending…
$.extend
$.extend({
  aBaz: function() {
    var x;
    for (i = 0; i < 10; i++) {
      x = Math.random();
    }
  }
});
$.aBaz();
pending…
Object.prototype
Object.prototype.aQuux = function() {
  var x;
  for (i = 0; i < 10; i++) {
    x = Math.random();
  }
};
var obj = {};
obj.aQuux();
pending…
plain code
var x;
for (i = 0; i < 10; i++) {
  x = Math.random();
}
pending…
function aFoo() {

}

$.extend(aFoo.prototype, {
  r: function() {
    var x;
    for (i = 0; i < 10; i++) {
      x = Math.random();
    }
  }
});
var x = new aFoo();
x.r();
pending…

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