arthurschreiber/each_bench.html

## each_bench.html
<!DOCTYPE html>
<html>
<head>
  <title>Benchmark for Array#_each</title>
  <script type="text/javascript" src="prototype.js"></script>
  <script type="text/javascript">
    var Benchmark = {
      results: [],
      iterations: 1000,
      run: function(name, fn) {
        var i = 0, start = (new Date).getTime();

        for(; i<this.iterations; ++i) {
          fn();
        }

        var end = (new Date).getTime();
        this.results.push([name, end - start])
      }
    };

    var array = $R(1, 1000).toArray();

    Benchmark.run("default #each", function() {
      array.each(Prototype.K);
    });

    Array.prototype._each = function(iterator) {
      for (var i = 0, length = this.length; i < length; iterator(this[i++]));
    };

    Benchmark.run("#each v1", function() {
      array.each(Prototype.K);
    });

    Array.prototype._each = function(iterator) {
      for (var i = 0, item; item = this[i] ; i++)
        iterator(item);
    };

    Benchmark.run("#each v2", function() {
      array.each(Prototype.K);
    });

    Array.prototype._each = function(iterator) {
      for (var i = 0, item; item = this[i++];)
        iterator(item);
     }

    Benchmark.run("#each v3", function() {
      array.each(Prototype.K);
    });

    Array.prototype._each = function(iterator) {
      for (var i = 0, item; item = this[i++]; iterator(item));
    }

    Benchmark.run("#each v4", function() {
      array.each(Prototype.K);
    });

    alert(Benchmark.results.inspect());
  </script>
</head>
<body>

</body>
</html>

## results.txt
Results:          Opera 10.50    Firefox 3.6    Firefox 3.7    Chrome 5.0.342.2    IE 8.0
Default #_each      431ms          733ms          727ms            149ms           1640ms
#_each v1           281ms          720ms          776ms            128ms           1525ms
#_each v2           289ms          714ms          777ms            132ms           1583ms
#_each v3           282ms          724ms          813ms            132ms           1603ms
#_each v4           285ms          720ms          812ms            131ms           1608ms

#_each v1 seems to have the best runtime in Chrome, Opera and IE 8.
	<!DOCTYPE html>
	<html>
	<head>
	<title>Benchmark for Array#_each</title>
	<script type="text/javascript" src="prototype.js"></script>
	<script type="text/javascript">
	var Benchmark = {
	results: [],
	iterations: 1000,
	run: function(name, fn) {
	var i = 0, start = (new Date).getTime();

	for(; i<this.iterations; ++i) {
	fn();
	}

	var end = (new Date).getTime();
	this.results.push([name, end - start])
	}
	};

	var array = $R(1, 1000).toArray();

	Benchmark.run("default #each", function() {
	array.each(Prototype.K);
	});

	Array.prototype._each = function(iterator) {
	for (var i = 0, length = this.length; i < length; iterator(this[i++]));
	};

	Benchmark.run("#each v1", function() {
	array.each(Prototype.K);
	});

	Array.prototype._each = function(iterator) {
	for (var i = 0, item; item = this[i] ; i++)
	iterator(item);
	};

	Benchmark.run("#each v2", function() {
	array.each(Prototype.K);
	});

	Array.prototype._each = function(iterator) {
	for (var i = 0, item; item = this[i++];)
	iterator(item);
	}

	Benchmark.run("#each v3", function() {
	array.each(Prototype.K);
	});

	Array.prototype._each = function(iterator) {
	for (var i = 0, item; item = this[i++]; iterator(item));
	}

	Benchmark.run("#each v4", function() {
	array.each(Prototype.K);
	});

	alert(Benchmark.results.inspect());
	</script>
	</head>
	<body>

	</body>
	</html>
	Results: Opera 10.50 Firefox 3.6 Firefox 3.7 Chrome 5.0.342.2 IE 8.0
	Default #_each 431ms 733ms 727ms 149ms 1640ms
	#_each v1 281ms 720ms 776ms 128ms 1525ms
	#_each v2 289ms 714ms 777ms 132ms 1583ms
	#_each v3 282ms 724ms 813ms 132ms 1603ms
	#_each v4 285ms 720ms 812ms 131ms 1608ms

	#_each v1 seems to have the best runtime in Chrome, Opera and IE 8.