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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>
function randomString()
{
    var text = "";
    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

    for( var i=0; i < 5; i++ )
        text += possible.charAt(Math.floor(Math.random() * possible.length));

    return text;
}
</script>

Setup JS

var map = new Map();
    var obj = {};
    
    var map2 = new Map();
    var obj2 = {};
    
    for (var i = 0; i < 1000; i++) {
      var key = randomString();
      var val = randomString();
      map2.set(key, val);
      obj2[key] = val;
    }

Teardown JS

Test cases

Test #1

Title *

Async

Code *

for (var i = 0; i < 1000; i++) {
  var key = randomString();
  var val = randomString();
  map.set(key, val);
}

Test #2

Title *

Async

Code *

for (var i = 0; i < 1000; i++) {
  var key = randomString();
  var val = randomString();
  obj[key] = val;
}

Test #3

Title *

Async

Code *

for (var key of map2.keys()) {
  var val = map2.get(key);
}

Test #4

Title *

Async

Code *

var key;
for (key in obj2) {
  if (obj2.hasOwnProperty(key)) {
    var val = obj2[key];
  }
}

Test #5

Title *

Async

Code *

for (var key in obj2) {
  var val = obj2[key];
}

Test #6

Title *

Async

Code *

for (var key of map2.keys()) {
  
}

Test #7

Title *

Async

Code *

for (var key in obj2) {
  
}