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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)

Setup JS

var i;
    var key;
    var keys;
    var l;
    var value;
    var hasOwnProperty = {}.hasOwnProperty;
    var parent = {};
    for (var i = 0; i < 10; i++)
      parent['x'+i] = i;
    var obj = Object.create(parent);
    for (var i = 0; i < 100; i++)
      obj['o'+i] = i;

Teardown JS

Test cases

Test #1

Title *

Async

Code *

for ( key in obj ) {
    if ( hasOwnProperty.call( obj,  key ) ) {
        value = obj[key];
    }
}

Test #2

Title *

Async

Code *

keys = Object.keys( obj );
for( i = 0, l = keys.length; i < l; i++ ) {
    value = obj[ keys[ i ] ];
}

Test #3

Title *

Async

Code *

keys = Object.keys( obj ).forEach(function( key ) {
  value = obj[ key ];
});