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README.md

Benchmark.js ^v1.0.0

A robust benchmarking library that works on nearly all JavaScript platforms¹, supports high-resolution timers, and returns statistically significant results. As seen on jsPerf.

BestieJS

Benchmark.js is part of the BestieJS "Best in Class" module collection. This means we promote solid browser/environment support, ES5 precedents, unit testing, and plenty of documentation.

Documentation

The documentation for Benchmark.js can be viewed here: http://benchmarkjs.com/docs

For a list of upcoming features, check out our roadmap.

Support

Benchmark.js has been tested in at least Adobe AIR 3.1, Chrome 5-21, Firefox 1.5-13, IE 6-9, Opera 9.25-12.01, Safari 3-6, Node.js 0.8.6, Narwhal 0.3.2, RingoJS 0.8, and Rhino 1.7RC5.

Installation and usage

In a browser or Adobe AIR:

<script src="benchmark.js"></script>

Optionally, expose Java’s nanosecond timer by adding the nano applet to the <body>:

<applet code="nano" archive="nano.jar"></applet>

Or enable Chrome’s microsecond timer by using the command line switch:

--enable-benchmarking

Via npm:

npm install benchmark

In Node.js and RingoJS v0.8.0+:

var Benchmark = require('benchmark');

Optionally, use the microtime module by Wade Simmons:

npm install microtime

In RingoJS v0.7.0-:

var Benchmark = require('benchmark').Benchmark;

In Rhino:

load('benchmark.js');

In an AMD loader like RequireJS:

require({
  'paths': {
    'benchmark': 'path/to/benchmark'
  }
},
['benchmark'], function(Benchmark) {
  console.log(Benchmark.version);
});

// or with platform.js
// https://github.com/bestiejs/platform.js
require({
  'paths': {
    'benchmark': 'path/to/benchmark',
    'platform': 'path/to/platform'
  }
},
['benchmark', 'platform'], function(Benchmark, platform) {
  Benchmark.platform = platform;
  console.log(Benchmark.platform.name);
});

Usage example:

var suite = new Benchmark.Suite;

// add tests
suite.add('RegExp#test', function() {
  /o/.test('Hello World!');
})
.add('String#indexOf', function() {
  'Hello World!'.indexOf('o') > -1;
})
// add listeners
.on('cycle', function(event) {
  console.log(String(event.target));
})
.on('complete', function() {
  console.log('Fastest is ' + this.filter('fastest').pluck('name'));
})
// run async
.run({ 'async': true });

// logs:
// > RegExp#test x 4,161,532 +-0.99% (59 cycles)
// > String#indexOf x 6,139,623 +-1.00% (131 cycles)
// > Fastest is String#indexOf

Authors

Contributors

Kit Cambridge