jQuery.each vs. for loop (v268)

Revision 268 of this benchmark created by imma on

Preparation HTML

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script>
  var a = $('*').get(),
      e;
  //https://gist.github.com/4081985
  var each = (function() {
    function each(arr, fn) {
      var len = arr.length;
      return (each[len] || (each[len] = each.factory(len), each[len]))(arr, fn);
    }
    each.factory = function(len) {
      var body = "\tvar i = 0;\n";
      while (len--) {
        body += "\tfn(i, arr[i++]);\n";
      }
      body += "\treturn;\n";
      return Function("arr", "fn", body);
    };
    return each;
  }());
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
jQuery.each
$.each(a, function(index, element) {
  e = element;
});
ready
for loop
for (var i = 0, len = a.length; i < len; i++) {
  e = a[i];
};
ready
for without caching
for (var i = 0; i < a.length; i++) {
  e = a[i];
};
ready
alternative for loop
for (var i in a) {
  e = a[i];
};
ready
reverse for
for (var i = a.length; i--;) {
  e = a[i];
};
ready
reverse while
var i = a.length
while (i--) {
  e = a[i];
};
ready
foreach
a.forEach(function(elem) {
  e = elem;
});
ready
reverse for, forward index
for (var i = a.length, end = i - 1; i--;) {
  e = a[end - i];
};
ready
anti-loop
each(a, function(i, elem) {
  e = elem;
});
ready
for loop variant 1
for (var i = -1, n = a.length; ++i < n;) {
  e = a[i];
};
ready
for loop variant 2
for (var item, i = -1; item = a[++i];) {
  e = item;
};
ready

Revisions

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