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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>
  obj = {
   _x: 0
  }
  
  var acc = 0;
  
  funct = {
   get: function() {
    return this._x
   },
   set: function(value) {
    this._x = value
   }
  }
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

Object.defineProperty(obj, "x", {
 get: funct['get'],
 set: funct['set']
})

for (var i = 0; i < 1000; i++) {
 obj.x = i;
 acc += obj.x;
}

Test #2

Title *

Async

Code *

obj.__defineGetter__('x', funct['get']);
obj.__defineSetter__('x', funct['set']);

for (var i = 0; i < 1000; i++) {
 obj.x = i;
 acc += obj.x;
}

Test #3

Title *

Async

Code *

for (var i = 0; i < 1000; i++) {
 obj._x = i;
 acc += obj._x;
}

Test #4

Title *

Async

Code *

obj.prototype = {
 get x() {
  return this._x;
 }, set x(value) {
  this_x = value;
 }
}

for (var i = 0; i < 1000; i++) {
 obj.x = i;
 acc += obj.x;
}

Test #5

Title *

Async

Code *

obj.setX = function(value) {
 this._x = value;
}

for (var i = 0; i < 1000; i++) {
 obj.setX(i);
 acc += obj._x;
}

Test #6

Title *

Async

Code *

Object.defineProperty(obj, "x", {
 value: 0,
 writable: false,
 configurable: false
})

for (var i = 0; i < 1000; i++) {
 obj.x = i;
 acc += obj.x;
}