Editing `jQuery.fn.each` vs. `jQuery.fn.quickEach`

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Preparation code

Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries)

//Original version by James Padolsey.
  jQuery.fn.origQuickEach = (function() {
    var jq = jQuery([1]);
    return function(c) {
      var i = -1,
          el, len = this.length;
      try {
        while (++i < len && (el = jq[0] = this[i]) && c.call(jq, i, el) !== false);
      } catch (e) {
        delete jq[0];
        throw e;
      }
      delete jq[0];
      return this;
    };
  }());

//Updated version supplied by roviury.
  jQuery.fn.updatedQuickEach = (function(jq) {
    return function(c) {
      var i = -1,
          el, len = this.length;
      try {
        while (++i < len && (el = jq[0] = this[i]) && c.call(jq, i, el) !== false);
      } catch (e) {
        throw e;
      } finally {
        delete jq[0];
      }
      return this;
    };
  })(jQuery([1])); //Bug-fix: Previously this was just jQuery().
  jQuery.fn.quickerEach = (function() {
    var jq = jQuery([1]);
    return function(c) {
      var i = -1,
          el;
      try {
        while (el = jq[0] = this[++i] && c.call(jq, i, el) !== false);
      } catch (e) {
        jq[0] = 1;
        throw e;
      }
      jq[0] = 1;
      return this;
    };
  }());
</script>

Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script>

Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ)

Define teardown for all tests (runs after each clocked test loop, outside of the timed code region) (see FAQ)

Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

//Added "addClass" to give real-world feel.
a.each(function() {
  $(this).addClass("wibble");
});

Test 2

Title

Async (check if this is an asynchronous test)

Code

//Implementation by James Padolsey.
//Added "addClass" to give real-world feel.
a.origQuickEach(function() {
  this.addClass("wibble"); // jQuery object
});

Test 3

Title

Async (check if this is an asynchronous test)

Code

//Implementation by roviury (uses finally for exception handling).
//Code is tighter, but the finally bit actually slows everything down
//(especially in Firefox).
//Added "addClass" to give real-world feel.
a.updatedQuickEach(function() {
  this.addClass("wibble"); // jQuery object
});

Test 4

Title

Async (check if this is an asynchronous test)

Code

//Implementation by Andy Harman.
//Added "addClass" to give real-world feel.
a.quickerEach(function() {
  this.addClass("wibble"); // jQuery object
});

Test 5

Title

Async (check if this is an asynchronous test)

Code

//Could go faster if you don't recreate the jQuery object each run.
var jq = jQuery([1]), i = -1;
while (jq[0] = a[++i]) {
  //Would obviously go faster if you go directly to the DOM instead
  //of using jQuery (performance versus maintenance).
  jq.addClass("wibble");
}

Test 6

Title

Async (check if this is an asynchronous test)

Code

//While-loop without a body is much faster that while-loop-with-body
//across all browsers that I have tested.
//This seems to be reason for the performance of quickerEach - it
//indicates that an anonymous method can be faster than using a
//while-loop that has a body section.
var jq = jQuery([1]), i = -1;
while (jq[0] = a[++i] && jq.addClass("wibble"));

Editing jQuery.fn.each vs. jQuery.fn.quickEach

Your details (optional)

Test case details

Preparation code

Code snippets to compare

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Editing `jQuery.fn.each` vs. `jQuery.fn.quickEach`