Underscore.each vs jQuery.each vs. for loop

JavaScript performance comparison

Revision 35 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
  var a = new Array(100000),
      e;
</script>

Preparation code output

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

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