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

Javascript array concat vs spread operator (v342)

Revision 342 of this benchmark created by Chris Albrecht on June 24, 2020

Setup

var arr1 = Array.from(Array(1000), (x,i) => i + 1)
  var arr2 = Array.from(Array(500), (x,i) => i - 1)

Test runner

Ready to run.

Testing in
Test		Ops/sec
spread operator	`arr1 = [...arr1, ...arr2];`	ready
push.apply	`arr1 = arr1.push(...arr2);`	ready

Revisions

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

Revision 1: published on September 1, 2013
Revision 3: published by alippai on October 5, 2013
Revision 4: published by alippai on October 12, 2013
Revision 5: published on November 3, 2013
Revision 7: published on December 3, 2013
Revision 8: published by cg on December 7, 2013
Revision 9: published on December 21, 2013
Revision 10: published on December 21, 2013
Revision 11: published on December 21, 2013
Revision 14: published by yesol on March 20, 2014
Revision 15: published on March 23, 2014
Revision 16: published by Giuseppe on March 27, 2014
Revision 17: published by Austin Appleby on April 1, 2014
Revision 18: published on April 9, 2014
Revision 19: published by Krinkle on May 23, 2014
Revision 20: published on May 28, 2014
Revision 21: published on June 9, 2014
Revision 22: published on July 12, 2014
Revision 23: published on July 21, 2014
Revision 25: published on July 24, 2014
Revision 26: published on August 2, 2014
Revision 27: published on August 6, 2014
Revision 28: published on August 16, 2014
Revision 30: published on August 16, 2014
Revision 31: published on August 16, 2014
Revision 32: published on September 2, 2014
Revision 33: published on September 2, 2014
Revision 34: published on September 2, 2014
Revision 35: published on September 2, 2014
Revision 36: published on September 6, 2014
Revision 37: published on September 6, 2014
Revision 38: published on September 7, 2014
Revision 39: published on September 7, 2014
Revision 41: published on October 8, 2014
Revision 42: published on October 12, 2014
Revision 43: published by bluefireuoop on October 15, 2014
Revision 44: published by bluefireuoop on October 15, 2014
Revision 45: published on October 24, 2014
Revision 46: published by Francesco Orsenigo on October 29, 2014
Revision 47: published on November 3, 2014
Revision 48: published on November 4, 2014
Revision 49: published on November 9, 2014
Revision 50: published on November 10, 2014
Revision 51: published by Brian on December 10, 2014
Revision 52: published on December 11, 2014
Revision 54: published on December 20, 2014
Revision 55: published on December 20, 2014
Revision 56: published on December 20, 2014
Revision 57: published by Yang Guan on January 21, 2015
Revision 60: published on February 20, 2015
Revision 61: published on February 23, 2015
Revision 62: published on February 24, 2015
Revision 63: published on February 24, 2015
Revision 64: published on February 27, 2015
Revision 65: published on March 4, 2015
Revision 100: published on January 26, 2016
Revision 170: published by Tai Shi Ling on May 2, 2019
Revision 300: published by Eugene Maslovich on December 11, 2019
Revision 336: published by Moein Porkamel on June 8, 2020
Revision 337: published by Chris Albrecht on June 24, 2020
Revision 338: published by Chris Albrecht on June 24, 2020
Revision 340: published by Chris Albrecht on June 24, 2020
Revision 341: published by Chris Albrecht on June 24, 2020
Revision 342: published by Chris Albrecht on June 24, 2020
Revision 343: published by Chris Albrecht on June 24, 2020
Revision 347: published on August 19, 2024