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

concat vs + vs join (v45)

Revision 45 of this benchmark created by Myron Yao on September 11, 2015

Setup

var i = Math.floor(Math.random() * 10);
  
  var a = '' + i++;
  var b = '' + i++;
  var c = '' + i++;
  var d = '' + i;

Test runner

Ready to run.

Testing in
Test		Ops/sec
concat	`a.concat(', ', b, ', ', c, ', ', d);`	ready
+	`a + ', ' + b + ', ' + c + ', ' + d;`	ready
join	`[a, b, c, d].join(', ');`	ready

Revisions

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

Revision 1: published by Nicolas Froidure on March 30, 2013
Revision 2: published by Kobi on April 20, 2013
Revision 4: published by Wei on June 17, 2013
Revision 5: published on July 24, 2013
Revision 7: published by Konrad Borowski on August 2, 2013
Revision 8: published by Ben Combee on August 18, 2013
Revision 9: published by Mark Johnson on August 28, 2013
Revision 10: published on December 11, 2013
Revision 11: published on January 20, 2014
Revision 12: published on January 20, 2014
Revision 13: published on April 18, 2014
Revision 14: published on May 6, 2014
Revision 15: published on May 6, 2014
Revision 16: published on June 10, 2014
Revision 18: published on June 11, 2014
Revision 19: published on July 3, 2014
Revision 20: published by JulienW on August 19, 2014
Revision 21: published by ThoAppelsin on September 11, 2014
Revision 23: published by tuanquynet on September 25, 2014
Revision 26: published by Ricardo on October 10, 2014
Revision 28: published by Ricardo on October 10, 2014
Revision 29: published on October 12, 2014
Revision 30: published on October 12, 2014
Revision 33: published on January 25, 2015
Revision 34: published by Denise on February 8, 2015
Revision 35: published by Luiz Tanure on February 25, 2015
Revision 36: published by Raphael Mu on March 8, 2015
Revision 37: published on April 23, 2015
Revision 38: published on May 4, 2015
Revision 39: published by Bergi on June 3, 2015
Revision 40: published by Bergi on June 3, 2015
Revision 41: published by Bergi on June 3, 2015
Revision 42: published by t on June 11, 2015
Revision 43: published on June 12, 2015
Revision 44: published by Igwe Kalu on August 19, 2015
Revision 45: published by Myron Yao on September 11, 2015
Revision 47: published by David on October 16, 2015
Revision 48: published on November 18, 2015
Revision 49: published on December 3, 2015
Revision 50: published on December 3, 2015
Revision 51: published on December 3, 2015
Revision 52: published on December 19, 2015
Revision 53: published on December 19, 2015
Revision 54: published on December 19, 2015
Revision 55: published on December 20, 2015
Revision 61: published by Miguel Guzmán on November 2, 2019
Revision 62: published by Miguel Guzmán on November 2, 2019
Revision 64: published on November 27, 2019