Underscore.each vs jQuery.each vs. for loop vs. nimble-foreach

JavaScript performance comparison

Revision 196 of this test case created

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,
      a = "t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t".split(","),
      e;
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jQuery.each
 
$.each(a, function(index, val) {
  val = pi;
});
 pending…
good old for loop
 
for (var i = 0, len = a.length; i < len; i++) {
  a[i] = pi;
};
 pending…
Array.forEach
 
a.forEach(function(v, k, array) {
  array[k] = pi;
});
 pending…
Array.forEach 2
 
a.forEach(function(v) {
  v = pi;
});
 pending…

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