jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.

jsperf.com URLs are mirrored at the same path, e.g:

https://jsperf.com/negative-modulo/2

Can be accessed at:

https://jsperf.app/negative-modulo/2

custom array forEach (v34)

Revision 34 of this benchmark created by Al on December 24, 2015

Preparation HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.1/lodash.min.js"></script>

Setup

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 
  var func=function(){2+2};
  
  Array.prototype.forEach2=function(a){
    var l=this.length;
    for(var i=0;i<l;i++)a(this[i],i)
  }
  
  Array.prototype.map2=function(a){
  var l=this.length;
  var array=new Array(l),i=0;
  for(;i<l;i++){array[i]=a(this[i],i)}
  return array;
  }
  
  Array.prototype.forEach3=function(a){
    var i=this.length;
    while(i--) a(this[i],i);
  }
  
  Array.prototype.forEach4=function(a){
    var i = 0, len = this.length;
    while (i < len) {
      a(this[i],i);
      i++;
    }
  }
  
  Array.prototype.forEach5=function(a){
    for (var i = 0, len = this.length; i < len; i++) {
      a(this[i],i);
    }
  }
  
  Array.prototype.forEach6=function(a){
    for (var i = this.length; i > 0; i--) {
      a(this[i],i);
    }
  }

Test runner

Ready to run.

Testing in
Test		Ops/sec
for	`for(var i=array.length;i--;) { func(); }`	ready
foreach	`array.forEach(func)`	ready
custom foreach	`array.forEach2(func)`	ready
map	`array.map(func)`	ready
custom map	`array.map2(func)`	ready
lodash each	`_.each(array, func)`	ready
while i--	`array.forEach3(func)`	ready
while i < this.lenght	`array.forEach4(func)`	ready
for with length cached	`array.forEach5(func)`	ready
for i > 0	`array.forEach6(func)`	ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

Revision 1: published by william malo on April 20, 2013
Revision 2: published on May 21, 2013
Revision 3: published by william malo on July 30, 2013
Revision 4: published on September 8, 2013
Revision 5: published on November 29, 2013
Revision 7: published on January 13, 2014
Revision 8: published on January 13, 2014
Revision 9: published by eakorea on January 14, 2014
Revision 10: published on February 24, 2014
Revision 11: published on June 12, 2014
Revision 12: published by termi on August 1, 2014
Revision 13: published on September 23, 2014
Revision 14: published on September 23, 2014
Revision 17: published on December 10, 2014
Revision 18: published on April 12, 2015
Revision 19: published by Nick on April 21, 2015
Revision 20: published by Alexander Karagulamos on May 1, 2015
Revision 21: published by Alexander Karagulamos on May 1, 2015
Revision 22: published by Mike on May 21, 2015
Revision 23: published on June 16, 2015
Revision 31: published by Dennis Cameron on December 16, 2015
Revision 33: published by Ywein on December 17, 2015
Revision 34: published by Al on December 24, 2015
Revision 35: published on January 20, 2016
Revision 36: published on January 20, 2016
Revision 37: published on January 20, 2016