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
Ways of counting the number of properties in an object (added precomputed baseline - SBD)
<script src="http://cdnjs.cloudflare.com/ajax/libs/lodash.js/1.2.1/lodash.min.js"></script>
<script src="http://underscorejs.org/underscore-min.js"></script>
<script>
var _u = _.noConflict();
</script>
// Create a list of objects of various lengths generated with:
// for( var i = 1; i < 10; i++ ) {
// console.log( Math.floor( Math.random() * 1000 ) );
// }
var lengths = [ 326, 140, 688, 20, 582, 416, 278, 803, 845 ];
// var lengths = [ 3, 1, 6, 2, 5, 4, 2, 8, 8 ];
var objects = [];
for( var iObject = 0; iObject < lengths.length; iObject++ ) {
var obj = {};
var len = lengths[iObject];
for( var iProp = 0; iProp < len; iProp++ ) {
var prop = [ 'z', iObject, iProp ].join('|');
obj[prop] = 'z' + prop;
}
obj.len = len;
objects.push( obj );
}
function ObjectLengthCount( object ) {
var length = 0;
for( var key in object ) {
if( object.hasOwnProperty(key) ) {
++length;
}
}
return length;
}
function ObjectLengthModern( object ) {
return Object.keys(object).length;
}
var ObjectLengthEither =
Object.keys ? ObjectLengthModern : ObjectLengthCount;
objects = [];
Ready to run.
Test | Ops/sec | |
---|---|---|
Object.keys(object).length |
| ready |
Counting in a loop |
| ready |
Lo-Dash _.keys(object).length |
| ready |
Underscore _.keys(object).length |
| ready |
Counting or Modern |
| ready |
Lo-Dash _.size(object) |
| ready |
Underscore _.size(object) |
| ready |
Precomputed |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.