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

JavaScript performance comparison

Revision 103 of this test case created

Info

All test assume you want to do something with the respective item in the array.

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 a = new Array(1000), o;

var f_each = function(a, fn) {
    for (var i = 0, l = a.length; i < l; i++) {
        fn(a[i], i);
    }
}


</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jQuery.each
 
$.each(a, function(i, t) {
  o = t;
});
 pending…
good old for loop
 
for (var i = 0, l = a.length; i < l; i++) {
  o = a[i];
};
 pending…
underscore.each
 
_.each(a, function(t, i) {
  o = t;
});
 pending…
good old for loop (decrementing)
 
for (var i = a.length; i > 0; i--) {
  o = a[i];
};
 pending…
forEach
 
a.forEach(function(t, i) {
  o = t;
});
 pending…
functional
 
f_each(a, function(t, i) {
    o = t;
});
 pending…

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