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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 g = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27];
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var h = g.map(function(x) {
 return x + 2
});

Test #2

Title *

Async

Code *

var h = [];
g.forEach(function(x) {
 h.push(x + 2);
})

Test #3

Title *

Async

Code *

var h = [];
for (var i = 0, len = g.length; i < len; i++) {
 h.push(g[i] + 2);
}

Test #4

Title *

Async

Code *

//based on v8's implementation
//http://code.google.com/p/v8/source/browse/trunk/src/array.js#1219
var length = g.length;
var h = [];
var add2 = function(x){ return x + 2; }; 

for (var i = 0, len = g.length; i < len; i++) {
  if(i in g){
    var element = g[i];
    h[i] = add2(element);
  }
}