Underscore.each vs jQuery.each vs. for loop

JavaScript performance comparison

Revision 202 of this test case created

Info

updated to remove the possibility that things are just getting optimized to oblivion.

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 a = new Array(10000),
      e;
  for (var i = 0; i < a.length; i++) a[i] = i;
</script>

<script>
  function m(items, fn) {
    for(var i = 0, length = items.length; i < length; i++) {
      fn(items[i]);
    }
  } 
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jQuery.each
 
$.each(a, function() {
 e = pi + this;
});
 pending…
good old for loop
 
for (var i = 0, len = a.length; i < len; i++) {
 e = pi + a[i];
};
 pending…
underscore.each
 
_.each(a, function(item) {
 e = pi + item;
});
 pending…
micro
 
m(a, function(item) {
  e = pi + item;
});
 pending…

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