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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

Test case details

Title *

Description
(Markdown syntax is allowed)

Preparation Code

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

<script>
  var alphabet = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
  var alphatmp = [];
  
  for(i=0;i<20;i++)
      alphatmp.push(alphabet);
  
  var str_to_split = alphatmp.join(',');
  var myarray = str_to_split.split(',');
  
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var tmp = [];
for (i=0;i<myarray.length;i++){
  tmp.push(myarray[i]);
}

var output = tmp.join('');

Test #2

Title *

Async

Code *

var output = '';
for (i=0;i<myarray.length;i++){
output += myarray[i];
}

Test #3

Title *

Async

Code *

var output = '';
for (i=0;i<myarray.length;i++){
output = output.concat(myarray[i]);
}

Test #4

Title *

Async

Code *

var tmp = [];
tmp.length = myarray.length;
for (i=0;i<tmp.length;i++){
  tmp[i] = myarray[i];
}

var output = tmp.join('');

Test #5

Title *

Async

Code *

var tmp = myarray.slice();
for (i=0;i<tmp.length;i++){
  tmp[i] = myarray[i];
}

var output = tmp.join('');