Underscore.each vs jQuery.each vs. for loop vs. forEach

JavaScript performance comparison

Revision 88 of this test case created by Juan Arribillaga

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script src="//documentcloud.github.com/underscore/underscore-min.js">
</script>
<script>
  var pi = Math.PI;
  var e;
  var o = {};
  for(var i = 0; i < 10000; i++) {
    o["object" + i] = i;
  }
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jQuery.each
 
$.each(o, function() {
  e = pi;
});
 pending…
good old for loop
 
var i = 0,
    size = Object.keys(o).length;

for (i; i < size; ++i) {
  e = pi;
};
 pending…
underscore.each
 
_.each(o, function() {
  e = pi;
});
 pending…
good old for loop (with i++)
 
var i = 0,
    size = Object.keys(o).length;

for (i; i < size; i++) {
  e = pi;
};
 pending…

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