jQuery.each vs. various loop alternatives

JavaScript performance comparison

Revision 4 of this test case created by petsel

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
  var a = $('*').get(),
      e;
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jQuery.each
 
$.each(a, function() {
 e = this;
});
 pending…
for loop
 
for (var i = 0, len = a.length; i < len; i++) {
 e = a[i];
}
 pending…
while loop (partly fixed [see rv.3] - prefix decrement - still not safe enough due to the assignment within a falsy break condition)
 
var i = a.length;

while (e = a[--i]) {}
 pending…
while loop (decrementing)
 
var i = a.length;

while (--i) {
 e = a[i];
}
 pending…
while loop (incrementing)
 
var i = -1,
    len = a.length;

while (++i < len) {
 e = a[i];
}
 pending…
alternative for loop
 
for (var i in a) {
 e = a[i];
}
 pending…

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1 comment

astaza.com commented : ∞

nice puchmark thank you

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