topical media & game development
mobile-query-three-bench-benchmark.js-benchmark.js / js
/*!
* Benchmark.js <http://benchmarkjs.com/>
* Copyright 2010-2012 Mathias Bynens <http://mths.be/>
* Based on JSLitmus.js, copyright Robert Kieffer <http://broofa.com/>
* Modified by John-David Dalton <http://allyoucanleet.com/>
* Available under MIT license <http://mths.be/mit>
*/
;(function(window, undefined) {
Detect free variable `define`
var freeDefine = typeof define == 'function' &&
typeof define.amd == 'object' && define.amd && define,
Detect free variable `exports`
freeExports = typeof exports == 'object' && exports &&
(typeof global == 'object' && global && global == global.global && (window = global), exports),
Detect free variable `require`
freeRequire = typeof require == 'function' && require,
Used to assign each benchmark an incrimented id
counter = 0,
Used to crawl all properties regardless of enumerability
getAllKeys = Object.getOwnPropertyNames,
Used to get property descriptors
getDescriptor = Object.getOwnPropertyDescriptor,
Used in case an object doesn't have its own method
hasOwnProperty = {}.hasOwnProperty,
Used to check if an object is extensible
isExtensible = Object.isExtensible || function() { return true; },
Used to check if an own property is enumerable
propertyIsEnumerable = {}.propertyIsEnumerable,
Used to set property descriptors
setDescriptor = Object.defineProperty,
Used to resolve a value's internal [[Class]]
toString = {}.toString,
Used to integrity check compiled tests
uid = 'uid' + (+new Date),
Used to avoid infinite recursion when methods call each other
calledBy = {},
Used to avoid hz of Infinity
divisors = {
'1': 4096,
'2': 512,
'3': 64,
'4': 8,
'5': 0
},
T-Distribution two-tailed critical values for 95% confidence
http://www.itl.nist.gov/div898/handbook/eda/section3/eda3672.htm
distribution = {
'1': 12.706,'2': 4.303, '3': 3.182, '4': 2.776, '5': 2.571, '6': 2.447,
'7': 2.365, '8': 2.306, '9': 2.262, '10': 2.228, '11': 2.201, '12': 2.179,
'13': 2.16, '14': 2.145, '15': 2.131, '16': 2.12, '17': 2.11, '18': 2.101,
'19': 2.093, '20': 2.086, '21': 2.08, '22': 2.074, '23': 2.069, '24': 2.064,
'25': 2.06, '26': 2.056, '27': 2.052, '28': 2.048, '29': 2.045, '30': 2.042,
'infinity': 1.96
},
Used to flag environments/features
has = {
Detect Adobe AIR
'air': isClassOf(window.runtime, 'ScriptBridgingProxyObject'),
Detect if `arguments` objects have the correct internal [[Class]] value
'argumentsClass': isClassOf(arguments, 'Arguments'),
Detect if in a browser environment
'browser': isHostType(window, 'document') && isHostType(window, 'navigator'),
Detect if strings support accessing characters by index
'charByIndex':
// IE 8 supports indexes on string literals but not string objects
('x'[0] + Object('x')[0]) == 'xx',
Detect if strings have indexes as own properties
'charByOwnIndex':
// Narwhal, Rhino, RingoJS, IE 8*, and Opera < 10.52 support indexes on
// strings but don't detect them as own properties
'x'[0] == 'x' && hasKey('x', '0'),
Detect if functions support decompilation
'decompilation': !!(function() {
try {
// Safari 2.x removes commas in object literals
// from Function#toString results
// http://webk.it/11609
// Firefox 3.6 and Opera 9.25 strip grouping
// parentheses from Function#toString results
// http://bugzil.la/559438
return Function(
'return (' + (function(x) { return { 'x': '' + (1 + x) + '', 'y': 0 }; }) + ')'
)()(0).x === '1';
} catch(e) { }
}()),
Detect ES5+ property descriptor API
'descriptors' : !!(function() {
try {
var o = {};
return (setDescriptor(o, o, o), 'value' in getDescriptor(o, o));
} catch(e) { }
}()),
Detect ES5+ Object.getOwnPropertyNames()
'getAllKeys': !!(function() {
try {
return /\bvalueOf\b/.test(getAllKeys(Object.prototype));
} catch(e) { }
}()),
Detect if Java is enabled/exposed
'java': isClassOf(window.java, 'JavaPackage'),
Detect if the Timers API exists
'timeout': isHostType(window, 'setTimeout') && isHostType(window, 'clearTimeout')
},
Timer utility object used by `clock()` and `Deferred#resolve`.
@private
@type Object
timer = {
The timer namespace object or constructor.
@private
@memberOf timer
@type Function|Object
'ns': Date,
Starts the deferred timer.
@private
@memberOf timer
parameter: {Object} deferred The deferred instance.
'start': null, // lazy defined in `clock()`
Stops the deferred timer.
@private
@memberOf timer
parameter: {Object} deferred The deferred instance.
'stop': null // lazy defined in `clock()`
},
Shortcut for inverse results
noArgumentsClass = !has.argumentsClass,
noCharByIndex = !has.charByIndex,
noCharByOwnIndex = !has.charByOwnIndex,
Math shortcuts
abs = Math.abs,
floor = Math.floor,
max = Math.max,
min = Math.min,
pow = Math.pow,
sqrt = Math.sqrt;
/*--------------------------------------------------------------------------*/
Benchmark constructor.
@constructor
parameter: {String} name A name to identify the benchmark.
parameter: {Function|String} fn The test to benchmark.
parameter: {Object} [options={}] Options object.
@example
// basic usage (the `new` operator is optional)
var bench = new Benchmark(fn);
// or using a name first
var bench = new Benchmark('foo', fn);
// or with options
var bench = new Benchmark('foo', fn, {
// displayed by Benchmark#toString if `name` is not available
'id': 'xyz',
// called when the benchmark starts running
'onStart': onStart,
// called after each run cycle
'onCycle': onCycle,
// called when aborted
'onAbort': onAbort,
// called when a test errors
'onError': onError,
// called when reset
'onReset': onReset,
// called when the benchmark completes running
'onComplete': onComplete,
// compiled/called before the test loop
'setup': setup,
// compiled/called after the test loop
'teardown': teardown
});
// or name and options
var bench = new Benchmark('foo', {
// a flag to indicate the benchmark is deferred
'deferred': true,
// benchmark test function
'fn': function(deferred) {
// call resolve() when the deferred test is finished
deferred.resolve();
}
});
// or options only
var bench = new Benchmark({
// benchmark name
'name': 'foo',
// benchmark test as a string
'fn': '[1,2,3,4].sort()'
});
// a test's `this` binding is set to the benchmark instance
var bench = new Benchmark('foo', function() {
'My name is '.concat(this.name); // My name is foo
});
function Benchmark(name, fn, options) {
var me = this;
// allow instance creation without the `new` operator
if (me && me.constructor != Benchmark) {
return new Benchmark(name, fn, options);
}
// juggle arguments
if (isClassOf(name, 'Object')) {
// 1 argument (options)
options = name;
}
else if (isClassOf(name, 'Function')) {
// 2 arguments (fn, options)
options = fn;
fn = name;
}
else if (isClassOf(fn, 'Object')) {
// 2 arguments (name, options)
options = fn;
fn = null;
me.name = name;
}
else {
// 3 arguments (name, fn [, options])
me.name = name;
}
setOptions(me, options);
me.id || (me.id = ++counter);
me.fn == null && (me.fn = fn);
me.stats = extend({}, me.stats);
me.times = extend({}, me.times);
}
Deferred constructor.
@constructor
@memberOf Benchmark
parameter: {Object} bench The benchmark instance.
function Deferred(bench) {
var me = this;
if (me && me.constructor != Deferred) {
return new Deferred(bench);
}
me.benchmark = bench;
clock(me);
}
Event constructor.
@constructor
@memberOf Benchmark
parameter: {String|Object} type The event type.
function Event(type) {
var me = this;
return (me && me.constructor != Event)
? new Event(type)
: (type instanceof Event)
? type
: extend(me, typeof type == 'string' ? { 'type': type } : type);
}
Suite constructor.
@constructor
@memberOf Benchmark
parameter: {String} name A name to identify the suite.
parameter: {Object} [options={}] Options object.
@example
// basic usage (the `new` operator is optional)
var suite = new Benchmark.Suite;
// or using a name first
var suite = new Benchmark.Suite('foo');
// or with options
var suite = new Benchmark.Suite('foo', {
// called when the suite starts running
'onStart': onStart,
// called between running benchmarks
'onCycle': onCycle,
// called when aborted
'onAbort': onAbort,
// called when a test errors
'onError': onError,
// called when reset
'onReset': onReset,
// called when the suite completes running
'onComplete': onComplete
});
function Suite(name, options) {
var me = this;
// allow instance creation without the `new` operator
if (me && me.constructor != Suite) {
return new Suite(name, options);
}
// juggle arguments
if (isClassOf(name, 'Object')) {
// 1 argument (options)
options = name;
} else {
// 2 arguments (name [, options])
me.name = name;
}
setOptions(me, options);
}
/*--------------------------------------------------------------------------*/
Note: Some array methods have been implemented in plain JavaScript to avoid
bugs in IE, Opera, Rhino, and Mobile Safari.
IE compatibility mode and IE < 9 have buggy Array `shift()` and `splice()`
functions that fail to remove the last element, `object[0]`, of
array-like-objects even though the `length` property is set to `0`.
The `shift()` method is buggy in IE 8 compatibility mode, while `splice()`
is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9.
In Opera < 9.50 and some older/beta Mobile Safari versions using `unshift()`
generically to augment the `arguments` object will pave the value at index 0
without incrimenting the other values's indexes.
github.com/documentcloud/underscore/issues/9
Rhino and environments it powers, like Narwhal and RingoJS, may have
buggy Array `concat()`, `reverse()`, `shift()`, `slice()`, `splice()` and
`unshift()` functions that make sparse arrays non-sparse by assigning the
undefined indexes a value of undefined.
github.com/mozilla/rhino/commit/702abfed3f8ca043b2636efd31c14ba7552603dd
Creates an array containing the elements of the host array followed by the
elements of each argument in order.
@memberOf Benchmark.Suite
returns: {Array} The new array.
function concat() {
var value,
j = -1,
length = arguments.length,
result = slice.call(this),
index = result.length;
while (++j < length) {
value = arguments[j];
if (isClassOf(value, 'Array')) {
for (var k = 0, l = value.length; k < l; k++, index++) {
if (k in value) {
result[index] = value[k];
}
}
} else {
result[index] = value;
}
}
return result;
}
Utility function used by `shift()`, `splice()`, and `unshift()`.
@private
parameter: {Number} start The index to start inserting elements.
parameter: {Number} deleteCount The number of elements to delete from the insert point.
parameter: {Array} elements The elements to insert.
returns: {Array} An array of deleted elements.
function insert(start, deleteCount, elements) {
var deleteEnd = start + deleteCount,
elementCount = elements ? elements.length : 0,
index = start - 1,
length = start + elementCount,
object = this,
result = [],
tail = slice.call(object, deleteEnd);
// delete elements from the array
while (++index < deleteEnd) {
if (index in object) {
result[index - start] = object[index];
delete object[index];
}
}
// insert elements
index = start - 1;
while (++index < length) {
object[index] = elements[index - start];
}
// append tail elements
start = index--;
length = (object.length >>> 0) - deleteCount + elementCount;
while (++index < length) {
if ((index - start) in tail) {
object[index] = tail[index - start];
} else {
delete object[index];
}
}
// delete excess elements
deleteCount = deleteCount > elementCount ? deleteCount - elementCount : 0;
while (deleteCount--) {
delete object[length + deleteCount];
}
object.length = length;
return result;
}
Rearrange the host array's elements in reverse order.
@memberOf Benchmark.Suite
returns: {Array} The reversed array.
function reverse() {
var upperIndex,
value,
index = -1,
object = Object(this),
length = object.length >>> 0,
middle = floor(length / 2);
if (length > 1) {
while (++index < middle) {
upperIndex = length - index - 1;
value = upperIndex in object ? object[upperIndex] : uid;
if (index in object) {
object[upperIndex] = object[index];
} else {
delete object[upperIndex];
}
if (value != uid) {
object[index] = value;
} else {
delete object[index];
}
}
}
return object;
}
Removes the first element of the host array and returns it.
@memberOf Benchmark.Suite
returns: {Mixed} The first element of the array.
function shift() {
return insert.call(this, 0, 1)[0];
}
Creates an array of the host array's elements from the start index up to,
but not including, the end index.
@memberOf Benchmark.Suite
returns: {Array} The new array.
function slice(start, end) {
var index = -1,
object = Object(this),
length = object.length >>> 0,
result = [];
start = toInteger(start);
start = start < 0 ? max(length + start, 0) : min(start, length);
start--;
end = end == null ? length : toInteger(end);
end = end < 0 ? max(length + end, 0) : min(end, length);
while ((++index, ++start) < end) {
if (start in object) {
result[index] = object[start];
}
}
return result;
}
Allows removing a range of elements and/or inserting elements into the host array.
@memberOf Benchmark.Suite
returns: {Array} An array of removed elements.
function splice(start, deleteCount) {
var object = Object(this),
length = object.length >>> 0;
start = toInteger(start);
start = start < 0 ? max(length + start, 0) : min(start, length);
deleteCount = min(max(toInteger(deleteCount), 0), length - start);
return insert.call(object, start, deleteCount, slice.call(arguments, 2));
}
Converts the specified `value` to an integer.
@private
parameter: {Mixed} value The value to convert.
returns: {Number} The resulting integer.
function toInteger(value) {
value = +value;
return value === 0 || !isFinite(value) ? value || 0 : value - (value % 1);
}
Appends arguments to the host array.
@memberOf Benchmark.Suite
returns: {Number} The new length.
function unshift() {
var object = Object(this);
insert.call(object, 0, 0, arguments);
return object.length;
}
/*--------------------------------------------------------------------------*/
Executes a function, associated with a benchmark, synchronously or asynchronously.
@private
parameter: {Object} options The options object.
function call(options) {
options || (options = {});
var fn = options.fn;
(!options.async && fn || function() {
var bench = options.benchmark,
ids = bench._timerIds || (bench._timerIds = []),
index = ids.length;
// under normal use there should only be one id at any time per benchmark
ids.push(setTimeout(function() {
ids.splice(index, 1);
ids.length || delete bench._timerIds;
fn();
}, bench.delay * 1e3));
})();
}
Creates a function from the given arguments string and body.
@private
parameter: {String} args The comma separated function arguments.
parameter: {String} body The function body.
returns: {Function} The new function.
function createFunction() {
// lazy define
createFunction = function(args, body) {
var anchor = freeDefine ? define.amd : Benchmark,
prop = uid + 'createFunction';
runScript((freeDefine ? 'define.amd.' : 'Benchmark.') + prop + '=function(' + args + '){' + body + '}');
return [anchor[prop], delete anchor[prop]][0];
};
// fix JaegerMonkey bug
// http://bugzil.la/639720
createFunction = has.browser && (createFunction('', 'return"' + uid + '"') || noop)() == uid ? createFunction : Function;
return createFunction.apply(null, arguments);
}
Iterates over an object's properties, executing the `callback` for each.
Callbacks may terminate the loop by explicitly returning `false`.
@private
parameter: {Object} object The object to iterate over.
parameter: {Function} callback The function executed per own property.
parameter: {Object} options The options object.
returns: {Object} Returns the object iterated over.
function forProps() {
var forShadowed,
skipSeen,
forArgs = true,
shadowed = ['constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', 'toLocaleString', 'toString', 'valueOf'];
(function(enumFlag, key) {
// must use a non-native constructor to catch the Safari 2 issue
function Klass() { this.valueOf = 0; };
Klass.prototype.valueOf = 0;
// check various for-in bugs
for (key in new Klass) {
enumFlag += key == 'valueOf' ? 1 : 0;
}
// check if `arguments` objects have non-enumerable indexes
for (key in arguments) {
key == '0' && (forArgs = false);
}
// Safari 2 iterates over shadowed properties twice
// http://replay.waybackmachine.org/20090428222941/http://tobielangel.com/2007/1/29/for-in-loop-broken-in-safari/
skipSeen = enumFlag == 2;
// IE < 9 incorrectly makes an object's properties non-enumerable if they have
// the same name as other non-enumerable properties in its prototype chain.
forShadowed = !enumFlag;
}(0));
// lazy define
forProps = function(object, callback, options) {
options || (options = {});
var ctor,
key,
keys,
skipCtor,
done = !object,
result = [object, object = Object(object)][0],
which = options.which,
allFlag = which == 'all',
fn = callback,
index = -1,
iteratee = object,
length = object.length,
ownFlag = allFlag || which == 'own',
seen = {},
skipProto = isClassOf(object, 'Function'),
thisArg = options.bind;
object = Object(object);
if (thisArg !== undefined) {
callback = function(value, key, object) {
return fn.call(thisArg, value, key, object);
};
}
// iterate all properties
if (allFlag && has.getAllKeys) {
for (index = 0, keys = getAllKeys(object), length = keys.length; index < length; index++) {
key = keys[index];
if (callback(object[key], key, object) === false) {
break;
}
}
}
// else iterate only enumerable properties
else {
for (key in object) {
// Firefox < 3.6, Opera > 9.50 - Opera < 11.60, and Safari < 5.1
// (if the prototype or a property on the prototype has been set)
// incorrectly set a function's `prototype` property [[Enumerable]] value
// to `true`. Because of this we standardize on skipping the `prototype`
// property of functions regardless of their [[Enumerable]] value.
if ((done =
!(skipProto && key == 'prototype') &&
!(skipSeen && (hasKey(seen, key) || !(seen[key] = true))) &&
(!ownFlag || ownFlag && hasKey(object, key)) &&
callback(object[key], key, object) === false)) {
break;
}
}
// in IE < 9 strings don't support accessing characters by index
if (!done && (
forArgs && isArguments(object) ||
((noCharByIndex || noCharByOwnIndex) && isClassOf(object, 'String') &&
(iteratee = noCharByIndex ? object.split('') : object)))) {
while (++index < length) {
if ((done =
callback(iteratee[index], String(index), object) === false)) {
break;
}
}
}
if (!done && forShadowed) {
// Because IE < 9 can't set the `[[Enumerable]]` attribute of an existing
// property and the `constructor` property of a prototype defaults to
// non-enumerable, we manually skip the `constructor` property when we
// think we are iterating over a `prototype` object.
ctor = object.constructor;
skipCtor = ctor && ctor.prototype && ctor.prototype.constructor === ctor;
for (index = 0; index < 7; index++) {
key = shadowed[index];
if (!(skipCtor && key == 'constructor') &&
hasKey(object, key) &&
callback(object[key], key, object) === false) {
break;
}
}
}
}
return result;
};
return forProps.apply(null, arguments);
}
Gets the critical value for the specified degrees of freedom.
@private
parameter: {Number} df The degrees of freedom.
returns: {Number} The critical value.
function getCriticalValue(df) {
return distribution[Math.round(df) || 1] || distribution.infinity;
}
Gets the name of the first argument from a function's source.
@private
parameter: {Function} fn The function.
parameter: {String} altName A string used when the name of the first argument is unretrievable.
returns: {String} The argument name.
function getFirstArgument(fn, altName) {
return (!hasKey(fn, 'toString') &&
(/^[\s(]*function[^(]*\(([^\s,)]+)/.exec(fn) || 0)[1]) || altName || '';
}
Computes the arithmetic mean of a sample.
@private
parameter: {Array} sample The sample.
returns: {Number} The mean.
function getMean(sample) {
return reduce(sample, function(sum, x) {
return sum + x;
}) / sample.length || 0;
}
Gets the source code of a function.
@private
parameter: {Function} fn The function.
parameter: {String} altSource A string used when a function's source code is unretrievable.
returns: {String} The function's source code.
function getSource(fn, altSource) {
var result = altSource;
if (isStringable(fn)) {
result = String(fn);
} else if (has.decompilation) {
// escape the `{` for Firefox 1
result = (/^[^{]+\{([\s\S]*)}\s*/g, '');
}
Checks if a value is an `arguments` object.
@private
parameter: {Mixed} value The value to check.
returns: {Boolean} Returns `true` if the value is an `arguments` object, else `false`.
function isArguments() {
// lazy define
isArguments = function(value) {
return toString.call(value) == '[object Arguments]';
};
if (noArgumentsClass) {
isArguments = function(value) {
return hasKey(value, 'callee') &&
!(propertyIsEnumerable && propertyIsEnumerable.call(value, 'callee'));
};
}
return isArguments(arguments[0]);
}
Checks if an object is of the specified class.
@private
parameter: {Mixed} value The value to check.
parameter: {String} name The name of the class.
returns: {Boolean} Returns `true` if the value is of the specified class, else `false`.
function isClassOf(value, name) {
return value != null && toString.call(value) == '[object ' + name + ']';
}
Host objects can return type values that are different from their actual
data type. The objects we are concerned with usually return non-primitive
types of object, function, or unknown.
@private
parameter: {Mixed} object The owner of the property.
parameter: {String} property The property to check.
returns: {Boolean} Returns `true` if the property value is a non-primitive, else `false`.
function isHostType(object, property) {
var type = object != null ? typeof object[property] : 'number';
return !/^(?:boolean|number|string|undefined)
Checks if the specified `value` is an object created by the `Object` constructor.
@private
parameter: {Mixed} value The value to check.
returns: {Boolean} Returns `true` if `value` is an object, else `false`.
function isObject(value) {
var ctor,
result = !!value && toString.call(value) == '[object Object]';
if (result && noArgumentsClass) {
// avoid false positives for `arguments` objects in IE < 9
result = !isArguments(value);
}
if (result) {
// IE < 9 presents nodes like `Object` objects:
// IE < 8 are missing the node's constructor property
// IE 8 node constructors are typeof "object"
ctor = value.constructor;
// check if the constructor is `Object` as `Object instanceof Object` is `true`
if ((result = isClassOf(ctor, 'Function') && ctor instanceof ctor)) {
// assume objects created by the `Object` constructor have no inherited enumerable properties
// (we assume there are no `Object.prototype` extensions)
forProps(value, function(subValue, subKey) {
result = subKey;
});
// An object's own properties are iterated before inherited properties.
// If the last iterated key belongs to an object's own property then
// there are no inherited enumerable properties.
result = result === true || hasKey(value, result);
}
}
return result;
}
Checks if a value can be safely coerced to a string.
@private
parameter: {Mixed} value The value to check.
returns: {Boolean} Returns `true` if the value can be coerced, else `false`.
function isStringable(value) {
return hasKey(value, 'toString') || isClassOf(value, 'String');
}
Wraps a function and passes `this` to the original function as the first argument.
@private
parameter: {Function} fn The function to be wrapped.
returns: {Function} The new function.
function methodize(fn) {
return function() {
var args = [this];
args.push.apply(args, arguments);
return fn.apply(null, args);
};
}
A no-operation function.
@private
function noop() {
// no operation performed
}
A wrapper around require() to suppress `module missing` errors.
@private
parameter: {String} id The module id.
returns: {Mixed} The exported module or `null`.
function req(id) {
try {
return freeExports && freeRequire(id);
} catch(e) { }
return null;
}
Runs a snippet of JavaScript via script injection.
@private
parameter: {String} code The code to run.
function runScript(code) {
var anchor = freeDefine ? define.amd : Benchmark,
script = document.createElement('script'),
sibling = document.getElementsByTagName('script')[0],
parent = sibling.parentNode,
prop = uid + 'runScript',
prefix = '(' + (freeDefine ? 'define.amd.' : 'Benchmark.') + prop + '||function(){})();';
// Firefox 2.0.0.2 cannot use script injection as intended because it executes
// asynchronously, but that's OK because script injection is only used to avoid
// the previously commented JaegerMonkey bug.
try {
// remove the inserted script *before* running the code to avoid differences
// in the expected script element count/order of the document.
script.appendChild(document.createTextNode(prefix + code));
anchor[prop] = function() { parent.removeChild(script); };
} catch(e) {
parent = parent.cloneNode(false);
sibling = null;
script.text = code;
}
parent.insertBefore(script, sibling);
delete anchor[prop];
}
A helper function for setting options/event handlers.
@private
parameter: {Object} bench The benchmark instance.
parameter: {Object} [options={}] Options object.
function setOptions(bench, options) {
options = extend({}, bench.constructor.options, options);
bench.options = forOwn(options, function(value, key) {
if (value != null) {
// add event listeners
if (/^on[A-Z]/.test(key)) {
forEach(key.split(' '), function(key) {
bench.on(key.slice(2).toLowerCase(), value);
});
} else {
bench[key] = deepClone(value);
}
}
});
}
/*--------------------------------------------------------------------------*/
Handles cycling/completing the deferred benchmark.
@memberOf Benchmark.Deferred
function resolve() {
var me = this,
bench = me.benchmark;
if (++me.cycles < bench.count) {
// continue the test loop
(bench._host || bench).compiled.call(me, timer);
} else {
timer.stop(me);
call({
'async': true,
'benchmark': bench,
'fn': function() {
cycle({ 'benchmark': bench, 'deferred': me });
}
});
}
}
/*--------------------------------------------------------------------------*/
A deep clone utility.
@static
@memberOf Benchmark
parameter: {Mixed} value The value to clone.
returns: {Mixed} The cloned value.
function deepClone(value) {
var accessor,
circular,
clone,
ctor,
descriptor,
extensible,
key,
length,
markerKey,
parent,
result,
source,
subIndex,
data = { 'value': value },
index = 0,
marked = [],
queue = { 'length': 0 },
unmarked = [];
An easily detectable decorator for cloned values.
function Marker(object) {
this.raw = object;
}
Gets an available marker key for the given object.
function getMarkerKey(object) {
// avoid collisions with existing keys
var result = uid;
while (object[result] && object[result].constructor != Marker) {
result += 1;
}
return result;
}
The callback used by `forProps()`.
function propCallback(subValue, subKey) {
// exit early to avoid cloning the marker
if (subValue && subValue.constructor == Marker) {
return;
}
// add objects to the queue
if (subValue === Object(subValue)) {
queue[queue.length++] = { 'key': subKey, 'parent': clone, 'source': value };
}
// assign non-objects
else {
clone[subKey] = subValue;
}
}
do {
key = data.key;
parent = data.parent;
source = data.source;
clone = value = source ? source[key] : data.value;
accessor = circular = descriptor = false;
// create a basic clone to filter out functions, DOM elements, and
// other non `Object` objects
if (value === Object(value)) {
// use custom deep clone function if available
if (isClassOf(value.deepClone, 'Function')) {
clone = value.deepClone();
} else {
ctor = value.constructor;
switch (toString.call(value)) {
case '[object Array]':
clone = new ctor(value.length);
break;
case '[object Boolean]':
clone = new ctor(value == true);
break;
case '[object Date]':
clone = new ctor(+value);
break;
case '[object Object]':
isObject(value) && (clone = new ctor);
break;
case '[object Number]':
case '[object String]':
clone = new ctor(value);
break;
case '[object RegExp]':
clone = ctor(value.source,
(value.global ? 'g' : '') +
(value.ignoreCase ? 'i' : '') +
(value.multiline ? 'm' : ''));
}
}
// continue clone if `value` doesn't have an accessor descriptor
// http://es5.github.com/#x8.10.1
if (clone && clone != value &&
!(descriptor = source && has.descriptors && getDescriptor(source, key),
accessor = descriptor && (descriptor.get || descriptor.set))) {
// use an existing clone (circular reference)
if ((extensible = isExtensible(value))) {
markerKey = getMarkerKey(value);
if (value[markerKey]) {
circular = clone = value[markerKey].raw;
}
} else {
// for frozen/sealed objects
for (subIndex = 0, length = unmarked.length; subIndex < length; subIndex++) {
data = unmarked[subIndex];
if (data.object === value) {
circular = clone = data.clone;
break;
}
}
}
if (!circular) {
// mark object to allow quickly detecting circular references and tie it to its clone
if (extensible) {
value[markerKey] = new Marker(clone);
marked.push({ 'key': markerKey, 'object': value });
} else {
// for frozen/sealed objects
unmarked.push({ 'clone': clone, 'object': value });
}
// iterate over object properties
forProps(value, propCallback, { 'which': 'all' });
}
}
}
if (parent) {
// for custom property descriptors
if (accessor || (descriptor &&
!(descriptor.configurable && descriptor.enumerable && descriptor.writable))) {
descriptor.value && (descriptor.value = clone);
setDescriptor(parent, key, descriptor);
}
// for default property descriptors
else {
parent[key] = clone;
}
} else {
result = clone;
}
} while ((data = queue[index++]));
// remove markers
for (index = 0, length = marked.length; index < length; index++) {
data = marked[index];
delete data.object[data.key];
}
return result;
}
An iteration utility for arrays and objects.
Callbacks may terminate the loop by explicitly returning `false`.
@static
@memberOf Benchmark
parameter: {Array|Object} object The object to iterate over.
parameter: {Function} callback The function called per iteration.
parameter: {Object} thisArg The `this` binding for the callback function.
returns: {Array|Object} Returns the object iterated over.
function each(object, callback, thisArg) {
var fn = callback,
index = -1,
result = [object, object = Object(object)][0],
origObject = object,
length = object.length,
isSnapshot = !!(object.snapshotItem && (length = object.snapshotLength)),
isSplittable = (noCharByIndex || noCharByOwnIndex) && isClassOf(object, 'String'),
isConvertable = isSnapshot || isSplittable || 'item' in object;
// in Opera < 10.5 `hasKey(object, 'length')` returns `false` for NodeLists
if (length === length >>> 0) {
if (isConvertable) {
// the third argument of the callback is the original non-array object
callback = function(value, index) {
return fn.call(this, value, index, origObject);
};
// in IE < 9 strings don't support accessing characters by index
if (isSplittable) {
object = object.split('');
} else {
object = [];
while (++index < length) {
// in Safari 2 `index in object` is always `false` for NodeLists
object[index] = isSnapshot ? result.snapshotItem(index) : result[index];
}
}
}
forEach(object, callback, thisArg);
} else {
forOwn(object, callback, thisArg);
}
return result;
}
Copies own/inherited properties of a source object to the destination object.
@static
@memberOf Benchmark
parameter: {Object} destination The destination object.
parameter: {Object} [source={}] The source object.
returns: {Object} The destination object.
function extend(destination, source) {
// Chrome < 14 incorrectly sets `destination` to `undefined` when we `delete arguments[0]`
// http://code.google.com/p/v8/issues/detail?id=839
destination = [destination, delete arguments[0]][0];
forEach(arguments, function(source) {
forProps(source, function(value, key) {
destination[key] = value;
});
});
return destination;
}
A generic `Array#filter` like method.
@static
@memberOf Benchmark
parameter: {Array} array The array to iterate over.
parameter: {Function|String} callback The function/alias called per iteration.
parameter: {Object} thisArg The `this` binding for the callback function.
returns: {Array} A new array of values that passed callback filter.
@example
// get odd numbers
Benchmark.filter([1, 2, 3, 4, 5], function(n) {
return n % 2;
}); // -> [1, 3, 5];
// get fastest benchmarks
Benchmark.filter(benches, 'fastest');
// get slowest benchmarks
Benchmark.filter(benches, 'slowest');
// get benchmarks that completed without erroring
Benchmark.filter(benches, 'successful');
function filter(array, callback, thisArg) {
var result;
if (callback == 'successful') {
// callback to exclude those that are errored, unrun, or have hz of Infinity
callback = function(bench) { return bench.cycles && isFinite(bench.hz); };
}
else if (callback == 'fastest' || callback == 'slowest') {
// get successful, sort by period + margin of error, and filter fastest/slowest
result = filter(array, 'successful').sort(function(a, b) {
a = a.stats; b = b.stats;
return (a.mean + a.moe > b.mean + b.moe ? 1 : -1) * (callback == 'fastest' ? 1 : -1);
});
result = filter(result, function(bench) {
return result[0].compare(bench) == 0;
});
}
return result || reduce(array, function(result, value, index) {
return callback.call(thisArg, value, index, array) ? (result.push(value), result) : result;
}, []);
}
A generic `Array#forEach` like method.
Callbacks may terminate the loop by explicitly returning `false`.
@static
@memberOf Benchmark
parameter: {Array} array The array to iterate over.
parameter: {Function} callback The function called per iteration.
parameter: {Object} thisArg The `this` binding for the callback function.
returns: {Array} Returns the array iterated over.
function forEach(array, callback, thisArg) {
var fn = callback,
index = -1,
length = (array = Object(array)).length >>> 0;
if (thisArg !== undefined) {
callback = function(value, index, array) {
return fn.call(thisArg, value, index, array);
};
}
while (++index < length) {
if (index in array &&
callback(array[index], index, array) === false) {
break;
}
}
return array;
}
Iterates over an object's own properties, executing the `callback` for each.
Callbacks may terminate the loop by explicitly returning `false`.
@static
@memberOf Benchmark
parameter: {Object} object The object to iterate over.
parameter: {Function} callback The function executed per own property.
parameter: {Object} thisArg The `this` binding for the callback function.
returns: {Object} Returns the object iterated over.
function forOwn(object, callback, thisArg) {
return forProps(object, callback, { 'bind': thisArg, 'which': 'own' });
}
Converts a number to a more readable comma-separated string representation.
@static
@memberOf Benchmark
parameter: {Number} number The number to convert.
returns: {String} The more readable string representation.
function formatNumber(number) {
number = String(number).split('.');
return number[0].replace(/(?=(?:\d{3})+)(?!\b)/g, ',') +
(number[1] ? '.' + number[1] : '');
}
Checks if an object has the specified key as a direct property.
@static
@memberOf Benchmark
parameter: {Object} object The object to check.
parameter: {String} key The key to check for.
returns: {Boolean} Returns `true` if key is a direct property, else `false`.
function hasKey() {
// lazy define for worst case fallback (not as accurate)
hasKey = function(object, key) {
var parent = object != null && (object.constructor || Object).prototype;
return !!parent && key in Object(object) && !(key in parent && object[key] === parent[key]);
};
// for modern browsers
if (isClassOf(hasOwnProperty, 'Function')) {
hasKey = function(object, key) {
return object != null && hasOwnProperty.call(object, key);
};
}
// for Safari 2
else if ({}.__proto__ == Object.prototype) {
hasKey = function(object, key) {
var result = false;
if (object != null) {
object = Object(object);
object.__proto__ = [object.__proto__, object.__proto__ = null, result = key in object][0];
}
return result;
};
}
return hasKey.apply(this, arguments);
}
A generic `Array#indexOf` like method.
@static
@memberOf Benchmark
parameter: {Array} array The array to iterate over.
parameter: {Mixed} value The value to search for.
parameter: {Number} [fromIndex=0] The index to start searching from.
returns: {Number} The index of the matched value or `-1`.
function indexOf(array, value, fromIndex) {
var index = toInteger(fromIndex),
length = (array = Object(array)).length >>> 0;
index = (index < 0 ? max(0, length + index) : index) - 1;
while (++index < length) {
if (index in array && value === array[index]) {
return index;
}
}
return -1;
}
Modify a string by replacing named tokens with matching object property values.
@static
@memberOf Benchmark
parameter: {String} string The string to modify.
parameter: {Object} object The template object.
returns: {String} The modified string.
function interpolate(string, object) {
forOwn(object, function(value, key) {
string = string.replace(RegExp('#\\{' + key + '\\}', 'g'), value);
});
return string;
}
Invokes a method on all items in an array.
@static
@memberOf Benchmark
parameter: {Array} benches Array of benchmarks to iterate over.
parameter: {String|Object} name The name of the method to invoke OR options object.
parameter: {Mixed} [arg1, arg2, ...] Arguments to invoke the method with.
returns: {Array} A new array of values returned from each method invoked.
@example
// invoke `reset` on all benchmarks
Benchmark.invoke(benches, 'reset');
// invoke `emit` with arguments
Benchmark.invoke(benches, 'emit', 'complete', listener);
// invoke `run(true)`, treat benchmarks as a queue, and register invoke callbacks
Benchmark.invoke(benches, {
// invoke the `run` method
'name': 'run',
// pass a single argument
'args': true,
// treat as queue, removing benchmarks from front of `benches` until empty
'queued': true,
// called before any benchmarks have been invoked.
'onStart': onStart,
// called between invoking benchmarks
'onCycle': onCycle,
// called after all benchmarks have been invoked.
'onComplete': onComplete
});
function invoke(benches, name) {
var args,
bench,
queued,
index = -1,
options = { 'onStart': noop, 'onCycle': noop, 'onComplete': noop },
result = map(benches, function(bench) { return bench; });
Checks if invoking `run` with asynchronous cycles.
function isAsync(object) {
var async = args[0] && args[0].async;
return isRun(object) && (async == null ? object.options.async : async) && has.timeout;
}
Checks if invoking `run` on a benchmark instance.
function isRun(object) {
// avoid using `instanceof` here because of IE memory leak issues with host objects
return Object(object).constructor == Benchmark && name == 'run';
}
Checks if invoking `run` with synchronous cycles.
function isSync(object) {
// if not asynchronous or deferred
return !isAsync(object) && !(isRun(object) && object.defer);
}
Executes the method and if synchronous, fetches the next bench.
function execute() {
var listeners,
sync = isSync(bench);
if (!sync) {
// use `getNext` as a listener
bench.on('complete', getNext);
listeners = bench.events.complete;
listeners.splice(0, 0, listeners.pop());
}
// execute method
result[index] = isClassOf(bench && bench[name], 'Function') ? bench[name].apply(bench, args) : undefined;
// if synchronous return true until finished
return sync && getNext();
}
Fetches the next bench or executes `onComplete` callback.
function getNext() {
var last = bench,
sync = isSync(last);
if (!sync) {
last.removeListener('complete', getNext);
last.emit('complete');
}
// choose next benchmark if not exiting early
if (options.onCycle.call(benches, Event('cycle'), last) !== false && raiseIndex() !== false) {
bench = queued ? benches[0] : result[index];
if (!isSync(bench)) {
call({ 'async': isAsync(bench), 'benchmark': bench, 'fn': execute });
}
else if (!sync) {
// resume synchronous execution
while (execute()) { }
}
else {
// continue synchronous execution
return true;
}
} else {
options.onComplete.call(benches, Event('complete'), last);
}
// when async the `return false` will cancel the rest of the "complete"
// listeners because they were called above and when synchronous it will
// exit the while-loop
return false;
}
Raises `index` to the next defined index or returns `false`.
function raiseIndex() {
var length = result.length;
// if queued then remove the previous bench and subsequent skipped non-entries
if (queued) {
do {
++index > 0 && shift.call(benches);
} while ((length = benches.length) && !('0' in benches));
}
else {
while (++index < length && !(index in result)) { }
}
// if we reached the last index then return `false`
return (queued ? length : index < length) ? index : (index = false);
}
// juggle arguments
if (isClassOf(name, 'String')) {
// 2 arguments (array, name)
args = slice.call(arguments, 2);
} else {
// 2 arguments (array, options)
options = extend(options, name);
name = options.name;
args = isClassOf(args = 'args' in options ? options.args : [], 'Array') ? args : [args];
queued = options.queued;
}
// start iterating over the array
if (raiseIndex() !== false) {
bench = result[index];
options.onStart.call(benches, Event('start'), bench);
// end early if the suite was aborted in an "onStart" listener
if (benches.aborted && benches.constructor == Suite && name == 'run') {
options.onCycle.call(benches, Event('cycle'), bench);
options.onComplete.call(benches, Event('complete'), bench);
}
// else start
else {
if (isAsync(bench)) {
call({ 'async': true, 'benchmark': bench, 'fn': execute });
} else {
while (execute()) { }
}
}
}
return result;
}
Creates a string of joined array values or object key-value pairs.
@static
@memberOf Benchmark
parameter: {Array|Object} object The object to operate on.
parameter: {String} [separator1=','] The separator used between key-value pairs.
parameter: {String} [separator2=': '] The separator used between keys and values.
returns: {String} The joined result.
function join(object, separator1, separator2) {
var result = [],
length = (object = Object(object)).length,
arrayLike = length === length >>> 0;
separator2 || (separator2 = ': ');
each(object, function(value, key) {
result.push(arrayLike ? value : key + separator2 + value);
});
return result.join(separator1 || ',');
}
A generic `Array#map` like method.
@static
@memberOf Benchmark
parameter: {Array} array The array to iterate over.
parameter: {Function} callback The function called per iteration.
parameter: {Object} thisArg The `this` binding for the callback function.
returns: {Array} A new array of values returned by the callback.
function map(array, callback, thisArg) {
return reduce(array, function(result, value, index) {
result[index] = callback.call(thisArg, value, index, array);
return result;
}, Array(Object(array).length >>> 0));
}
Retrieves the value of a specified property from all items in an array.
@static
@memberOf Benchmark
parameter: {Array} array The array to iterate over.
parameter: {String} property The property to pluck.
returns: {Array} A new array of property values.
function pluck(array, property) {
return map(array, function(object) {
return object == null ? undefined : object[property];
});
}
A generic `Array#reduce` like method.
@static
@memberOf Benchmark
parameter: {Array} array The array to iterate over.
parameter: {Function} callback The function called per iteration.
parameter: {Mixed} accumulator Initial value of the accumulator.
returns: {Mixed} The accumulator.
function reduce(array, callback, accumulator) {
var noaccum = arguments.length < 3;
forEach(array, function(value, index) {
accumulator = noaccum ? (noaccum = 0, value) : callback(accumulator, value, index, array);
});
return accumulator;
}
/*--------------------------------------------------------------------------*/
Aborts all benchmarks in the suite.
@name abort
@memberOf Benchmark.Suite
returns: {Object} The suite instance.
function abortSuite() {
var me = this;
if (me.running) {
calledBy.abortSuite = true;
me.reset();
delete calledBy.abortSuite;
me.aborted = true;
!calledBy.resetSuite && invoke(me, 'abort');
me.emit('abort');
}
return me;
}
Adds a test to the benchmark suite.
@memberOf Benchmark.Suite
parameter: {String} name A name to identify the benchmark.
parameter: {Function|String} fn The test to benchmark.
parameter: {Object} [options={}] Options object.
returns: {Object} The benchmark instance.
@example
// basic usage
suite.add(fn);
// or using a name first
suite.add('foo', fn);
// or with options
suite.add('foo', fn, {
'onCycle': onCycle,
'onComplete': onComplete
});
function add(name, fn, options) {
var me = this,
bench = Benchmark(name, fn, options);
me.push(bench);
me.emit('add', bench);
return me;
}
Creates a new suite with cloned benchmarks.
@name clone
@memberOf Benchmark.Suite
parameter: {Object} options Options object to overwrite cloned options.
returns: {Object} The new suite instance.
function cloneSuite(options) {
var me = this,
result = new me.constructor(extend({}, me.options, options));
// copy own properties
forOwn(me, function(value, key) {
if (!hasKey(result, key)) {
result[key] = value && isClassOf(value.clone, 'Function') ? value.clone() : deepClone(value);
}
});
return result;
}
An `Array#filter` like method.
@name filter
@memberOf Benchmark.Suite
parameter: {Function|String} callback The function/alias called per iteration.
returns: {Object} A new suite of benchmarks that passed callback filter.
function filterSuite(callback) {
var me = this,
result = new me.constructor;
result.push.apply(result, filter(me, callback));
return result;
}
Resets all benchmarks in the suite.
@name reset
@memberOf Benchmark.Suite
returns: {Object} The suite instance.
function resetSuite() {
var me = this,
notAborting = !calledBy.abortSuite;
if (me.running && notAborting) {
calledBy.resetSuite = true;
me.abort();
delete calledBy.resetSuite;
me.aborted = false;
}
else if (me.aborted !== false || me.running !== false) {
me.aborted = me.running = false;
notAborting && invoke(me, 'reset');
me.emit('reset');
}
return me;
}
Runs the suite.
@name run
@memberOf Benchmark.Suite
parameter: {Object} [options={}] Options object.
returns: {Object} The suite instance.
@example
// basic usage
suite.run();
// or with options
suite.run({ 'async': true, 'queued': true });
function runSuite(options) {
var me = this,
benches = [];
me.reset();
me.running = true;
options || (options = {});
invoke(me, {
'name': 'run',
'args': options,
'queued': options.queued,
'onStart': function(event, bench) {
me.emit('start', bench);
},
'onCycle': function(event, bench) {
if (bench.error) {
me.emit('error', bench);
} else if (bench.cycles) {
benches.push(bench);
}
return !me.aborted && me.emit('cycle', bench);
},
'onComplete': function(event, bench) {
me.running = false;
me.emit('complete', bench);
}
});
return me;
}
/*--------------------------------------------------------------------------*/
Registers a single listener for the specified event type(s).
@memberOf Benchmark, Benchmark.Suite
parameter: {String} type The event type.
parameter: {Function} listener The function called when the event occurs.
returns: {Object} The benchmark instance.
@example
// register a listener for an event type
bench.addListener('cycle', listener);
// register a listener for multiple event types
bench.addListener('start cycle', listener);
function addListener(type, listener) {
var me = this,
events = me.events || (me.events = {});
forEach(type.split(' '), function(type) {
(events[type] || (events[type] = [])).push(listener);
});
return me;
}
Executes all registered listeners of the specified event type.
@memberOf Benchmark, Benchmark.Suite
parameter: {String|Object} type The event type or object.
returns: {Boolean} Returns `true` if all listeners were executed, else `false`.
function emit(type) {
var me = this,
event = Event(type),
args = (arguments[0] = event, arguments),
events = me.events,
listeners = events && events[event.type] || [],
result = true;
forEach(listeners.slice(), function(listener) {
return (result = listener.apply(me, args) !== false);
});
return result;
}
Unregisters a single listener for the specified event type(s).
@memberOf Benchmark, Benchmark.Suite
parameter: {String} type The event type.
parameter: {Function} listener The function to unregister.
returns: {Object} The benchmark instance.
@example
// unregister a listener for an event type
bench.removeListener('cycle', listener);
// unregister a listener for multiple event types
bench.removeListener('start cycle', listener);
function removeListener(type, listener) {
var me = this,
events = me.events;
forEach(type.split(' '), function(type) {
var listeners = events && events[type] || [],
index = indexOf(listeners, listener);
if (index > -1) {
listeners.splice(index, 1);
}
});
return me;
}
Unregisters all listeners or those for the specified event type(s).
@memberOf Benchmark, Benchmark.Suite
parameter: {String} type The event type.
returns: {Object} The benchmark instance.
@example
// unregister all listeners
bench.removeAllListeners();
// unregister all listeners for an event type
bench.removeAllListeners('cycle');
// unregister all listeners for multiple event types
bench.removeAllListeners('start cycle complete');
function removeAllListeners(type) {
var me = this,
events = me.events;
forEach(type ? type.split(' ') : events, function(type) {
(events && events[type] || []).length = 0;
});
return me;
}
/*--------------------------------------------------------------------------*/
Aborts the benchmark without recording times.
@memberOf Benchmark
returns: {Object} The benchmark instance.
function abort() {
var me = this;
if (me.running) {
if (has.timeout) {
forEach(me._timerIds || [], clearTimeout);
delete me._timerIds;
}
// avoid infinite recursion
calledBy.abort = true;
me.reset();
delete calledBy.abort;
me.aborted = true;
me.emit('abort');
}
return me;
}
Creates a new benchmark using the same test and options.
@memberOf Benchmark
parameter: {Object} options Options object to overwrite cloned options.
returns: {Object} The new benchmark instance.
@example
var bizarro = bench.clone({
'name': 'doppelganger'
});
function clone(options) {
var me = this,
result = new me.constructor(extend({}, me, options));
// correct the `options` object
result.options = extend({}, me.options, options);
// copy own custom properties
forOwn(me, function(value, key) {
if (!hasKey(result, key)) {
result[key] = deepClone(value);
}
});
return result;
}
Determines if a benchmark is faster than another.
@memberOf Benchmark
parameter: {Object} other The benchmark to compare.
returns: {Number} Returns `-1` if slower, `1` if faster, and `0` if indeterminate.
function compare(other) {
// unpaired two-sample t-test assuming equal variance
// http://en.wikipedia.org/wiki/Student's_t-test
// http://www.chem.utoronto.ca/coursenotes/analsci/StatsTutorial/12tailed.html
var a = this.stats,
b = other.stats,
df = a.size + b.size - 2,
pooled = (((a.size - 1) * a.variance) + ((b.size - 1) * b.variance)) / df,
tstat = (a.mean - b.mean) / sqrt(pooled * (1 / a.size + 1 / b.size)),
near = abs(1 - a.mean / b.mean) < 0.055 && a.rme < 3 && b.rme < 3;
// check if the means aren't close and the t-statistic is significant
// (a larger `mean` indicates a slower benchmark)
return !near && abs(tstat) > getCriticalValue(df) ? (tstat > 0 ? -1 : 1) : 0;
}
Reset properties and abort if running.
@memberOf Benchmark
returns: {Object} The benchmark instance.
function reset() {
var changed,
pair,
me = this,
source = extend({}, me.constructor.prototype, me.options),
pairs = [[source, me]];
if (me.running && !calledBy.abort) {
// no worries, `reset()` is called within `abort()`
me.abort();
me.aborted = source.aborted;
}
else {
// a non-recursive solution to check if properties have changed
// http://www.jslab.dk/articles/non.recursive.preorder.traversal.part4
while ((pair = pairs.pop())) {
forOwn(pair[0], function(value, key) {
var other = pair[1][key];
if (value && isClassOf(value, 'Object')) {
pairs.push([value, other]);
}
else if (value !== other && !(value == null || isClassOf(value, 'Function'))) {
pair[1][key] = value;
changed = true;
}
});
}
if (changed) {
me.emit('reset');
}
}
return me;
}
Displays relevant benchmark information when coerced to a string.
@name toString
@memberOf Benchmark
returns: {String} A string representation of the benchmark instance.
function toStringBench() {
var me = this,
error = me.error,
hz = me.hz,
id = me.id,
stats = me.stats,
size = stats.size,
pm = has.java ? '+/-' : '\xb1',
result = me.name || (typeof id == 'number' ? '<Test #' + id + '>' : id);
if (error) {
result += ': ' + join(error);
} else {
result += ' x ' + formatNumber(hz.toFixed(hz < 100 ? 2 : 0)) + ' ops/sec ' + pm +
stats.rme.toFixed(2) + '% (' + size + ' run' + (size == 1 ? '' : 's') + ' sampled)';
}
return result;
}
/*--------------------------------------------------------------------------*/
Clocks the time taken to execute a test per cycle (secs).
@private
parameter: {Object} bench The benchmark instance.
returns: {Number} The time taken.
function clock() {
var applet,
options = Benchmark.options,
template = { 'begin': 's', 'end': 'r.setup()')),
'fn': getSource(fn, preprocess('f$(' + fnArg + ')')),
'fnArg': fnArg,
'teardown': getSource(host.teardown, preprocess('m'), interpolate(
preprocess(deferred
? 'var d,r.resolve,m=d,f.fn;' +
'if(!d.resolve=function(){d;r);' +
'if(d.count){#{teardown}\n}};#{setup}\nt);}#{fn}\nreturn{}'
: 'var r,m=m=m=t--){#{fn}\n}#{end};#{teardown}\nreturn{elapsed:r'), interpolate(
preprocess((bench.error && !stringable
? 'var r,m=m=m,s=this.count'
) + ',n.ns;#{setup}\n#{begin};while(i}'),
source
));
try {
// pretest one more time to check for errors
host.count = 1;
compiled.call(host, timer);
host.compiled = compiled;
host.count = count;
delete bench.error;
}
catch(e) {
host.count = count;
if (!bench.error) {
host.compiled = compiled;
bench.error = e || new Error(String(e));
}
}
}
}
// if no errors run the full test loop
if (!bench.error) {
result = compiled.call(deferred || host, timer).elapsed;
}
return result;
};
/*------------------------------------------------------------------------*/
Gets the current timer's minimum resolution (secs).
function getRes(unit) {
var measured,
begin,
count = 30,
divisor = 1e3,
ns = timer.ns,
sample = [];
// get average smallest measurable time
while (count--) {
if (unit == 'us') {
divisor = 1e6;
if (ns.stop) {
ns.start();
while (!(measured = ns.microseconds())) { }
} else {
begin = timer.ns();
while (!(measured = ns() - begin)) { }
}
}
else if (unit == 'ns') {
divisor = 1e9;
begin = ns.nanoTime();
while (!(measured = ns.nanoTime() - begin)) { }
}
else {
begin = new ns;
while (!(measured = new ns - begin)) { }
}
// check for broken timers (nanoTime may have issues)
// http://alivebutsleepy.srnet.cz/unreliable-system-nanotime/
if (measured > 0) {
sample.push(measured);
} else {
sample.push(Infinity);
break;
}
}
// convert to seconds
return getMean(sample) / divisor;
}
Replaces all occurrences of `
function preprocess(code) {
return interpolate(code, template).replace(/$/g, /\d+/.exec(uid));
}
/*------------------------------------------------------------------------*/
// detect nanosecond support from a Java applet
each(window.document && document.applets || [], function(element) {
return !(timer.ns = applet = 'nanoTime' in element && element);
});
// check type in case Safari returns an object instead of a number
try {
if (typeof timer.ns.nanoTime() == 'number') {
timers.push({ 'ns': timer.ns, 'res': getRes('ns'), 'unit': 'ns' });
}
} catch(e) { }
// detect Chrome's microsecond timer:
// enable benchmarking via the --enable-benchmarking command
// line switch in at least Chrome 7 to use chrome.Interval
try {
if ((timer.ns = new (window.chrome || window.chromium).Interval)) {
timers.push({ 'ns': timer.ns, 'res': getRes('us'), 'unit': 'us' });
}
} catch(e) { }
// detect Node's microtime module:
// npm install microtime
if ((timer.ns = (req('microtime') || { 'now': 0 }).now)) {
timers.push({ 'ns': timer.ns, 'res': getRes('us'), 'unit': 'us' });
}
// pick timer with highest resolution
timer = reduce(timers, function(timer, other) {
return other.res < timer.res ? other : timer;
});
// remove unused applet
if (timer.unit != 'ns' && applet) {
applet = (applet.parentNode.removeChild(applet), null);
}
// error if there are no working timers
if (timer.res == Infinity) {
throw new Error('Benchmark.js was unable to find a working timer.');
}
// use API of chosen timer
if (timer.unit == 'ns') {
extend(template, {
'begin': 's=n=(n)/1e9'
});
}
else if (timer.unit == 'us') {
extend(template, timer.ns.stop ? {
'begin': 's.start()',
'end': 'r.microseconds()/1e6'
} : {
'begin': 's=(n$()-s'),
preprocess('var n.timeStamp=s'),
preprocess('var n=o.elapsed=r
Computes stats on benchmark results.
@private
parameter: {Object} options The options object.
function compute(options) {
options || (options = {});
var async = options.async,
bench = options.benchmark,
elapsed = 0,
queue = [],
sample = [],
initCount = bench.initCount;
Adds a number of clones to the queue.
function enqueue(count) {
while (count--) {
queue.push(bench.clone({
'_host': bench,
'events': { 'start': [update], 'cycle': [update] }
}));
}
}
Updates the clone/host benchmarks to keep their data in sync.
function update(event) {
var clone = this,
cycles = clone.cycles,
type = event.type;
if (bench.running) {
if (type == 'cycle') {
if (clone.error) {
bench.abort();
bench.error = clone.error;
bench.emit('error');
}
else {
// Note: the host's bench.count prop is updated in `clock()`
bench.hz = clone.hz;
bench.initCount = clone.initCount;
bench.times.period = clone.times.period;
if (cycles > bench.cycles) {
bench.cycles = cycles;
}
}
bench.emit(type);
}
else {
// reached in clone's onStart
// Note: clone.minTime prop is inited in `clock()`
clone.count = bench.initCount;
}
} else if (bench.aborted) {
clone.abort();
}
}
Determines if more clones should be queued or if cycling should stop.
function evaluate(event, clone) {
var mean,
moe,
rme,
sd,
sem,
variance,
now = +new Date,
times = bench.times,
done = bench.aborted,
maxedOut = (elapsed += now - clone.times.timeStamp) / 1e3 > bench.maxTime,
size = sample.push(clone.times.period),
varOf = function(sum, x) { return sum + pow(x - mean, 2); };
// exit early for aborted or unclockable tests
if (done || clone.hz == Infinity) {
maxedOut = !(size = sample.length = queue.length = 0);
}
// set host values
if (!done) {
// sample mean (estimate of the population mean)
mean = getMean(sample);
// sample variance (estimate of the population variance)
variance = reduce(sample, varOf, 0) / (size - 1) || 0;
// sample standard deviation (estimate of the population standard deviation)
sd = sqrt(variance);
// standard error of the mean (a.k.a. the standard deviation of the sampling distribution of the sample mean)
sem = sd / sqrt(size);
// margin of error
moe = sem * getCriticalValue(size - 1);
// relative margin of error
rme = (moe / mean) * 100 || 0;
extend(bench.stats, {
'moe': moe,
'rme': rme,
'sem': sem,
'deviation': sd,
'mean': mean,
'size': size,
'variance': variance
});
// Exit early when the elapsed time exceeds the maximum time allowed
// per benchmark. To prevent massive wait times, we do this even if the
// minimum sample size has not been reached. We don't count cycle delays
// toward the max time because delays may be increased by browsers that
// clamp timeouts in inactive tabs.
// developer.mozilla.org/en/window.setTimeout#Inactive_tabs
if (maxedOut) {
done = true;
bench.running = false;
bench.initCount = initCount;
times.elapsed = (now - times.timeStamp) / 1e3;
}
if (bench.hz != Infinity) {
times.period = mean;
times.cycle = mean * bench.count;
bench.hz = 1 / mean;
}
}
// if time permits, increase sample size to reduce the margin of error
if (queue.length < 2 && !maxedOut) {
enqueue(1);
}
// stop the invoke cycle when done
return !done;
}
// init queue and begin
enqueue(bench.minSamples);
invoke(queue, {
'name': 'run',
'args': { 'async': async },
'queued': true,
'onCycle': evaluate,
'onComplete': function() {
bench.emit('complete');
}
});
}
Cycles a benchmark until a run `count` can be established.
@private
parameter: {Object} options The options object.
function cycle(options) {
options || (options = {});
var clocked,
divisor,
minTime,
period,
async = options.async,
bench = options.benchmark,
count = bench.count,
deferred = options.deferred,
times = bench.times;
// continue, if not aborted between cycles
if (bench.running) {
// host `minTime` is set to `Benchmark.options.minTime` in `clock()`
bench.cycles++;
clocked = deferred ? deferred.elapsed : clock(bench);
minTime = bench.minTime;
if (bench.error) {
bench.abort();
bench.emit('error');
}
}
// continue, if not errored
if (bench.running) {
// time taken to complete last test cycle
times.cycle = clocked;
// seconds per operation
period = times.period = clocked / count;
// ops per second
bench.hz = 1 / period;
// do we need to do another cycle?
bench.running = clocked < minTime;
// avoid working our way up to this next time
bench.initCount = count;
if (bench.running) {
// tests may clock at `0` when `initCount` is a small number,
// to avoid that we set its count to something a bit higher
if (!clocked && (divisor = divisors[bench.cycles]) != null) {
count = floor(4e6 / divisor);
}
// calculate how many more iterations it will take to achive the `minTime`
if (count <= bench.count) {
count += Math.ceil((minTime - clocked) / period);
}
bench.running = count != Infinity;
}
}
// should we exit early?
if (bench.emit('cycle') === false) {
bench.abort();
}
// figure out what to do next
if (bench.running) {
// start a new cycle
bench.count = count;
if (deferred) {
(bench._host || bench).compiled.call(deferred, timer);
} else {
call({
'async': async,
'benchmark': bench,
'fn': function() {
cycle({ 'async': async, 'benchmark': bench });
}
});
}
} else {
// fix TraceMonkey bug associated with clock fallbacks
// http://bugzil.la/509069
if (has.browser) {
runScript(uid + '=1;delete ' + uid);
}
// done
bench.emit('complete');
}
}
Runs the benchmark.
@memberOf Benchmark
parameter: {Object} [options={}] Options object.
returns: {Object} The benchmark instance.
@example
// basic usage
bench.run();
// or with options
bench.run({ 'async': true });
function run(options) {
var me = this,
async = ((async = options && options.async) == null ? me.async : async) && has.timeout;
// set running to false so reset() won't call abort()
me.running = false;
me.reset();
me.running = true;
me.count = me.initCount;
me.times.timeStamp = +new Date;
me.emit('start');
if (me._host) {
if (me.defer) {
Deferred(me);
} else {
cycle({ 'async': async, 'benchmark': me });
}
} else {
compute({ 'async': async, 'benchmark': me });
}
return me;
}
/*--------------------------------------------------------------------------*/
// Firefox 1 erroneously defines variable and argument names of functions on
// the function itself as non-configurable properties with `undefined` values.
// The bugginess continues as the `Benchmark` constructor has an argument
// named `options` and Firefox 1 will not assign a value to `Benchmark.options`,
// making it non-writable in the process, unless it is the first property
// assigned by for-in loop of `extend()`.
extend(Benchmark, {
The default options copied by benchmark instances.
@static
@memberOf Benchmark
@type Object
'options': {
A flag to indicate that benchmark cycles will execute asynchronously by default.
@memberOf Benchmark.options
@type Boolean
'async': false,
A flag to indicate that the benchmark clock is deferred.
@memberOf Benchmark.options
@type Boolean
'defer': false,
The delay between test cycles (secs).
@memberOf Benchmark.options
@type Number
'delay': 0.005,
Displayed by Benchmark#toString when a `name` is not available (auto-generated if `null`).
@memberOf Benchmark.options
@type String|Null
'id': null,
The default number of times to execute a test on a benchmark's first cycle.
@memberOf Benchmark.options
@type Number
'initCount': 1,
The maximum time a benchmark is allowed to run before finishing (secs).
Note: Cycle delays aren't counted toward the maximum time.
@memberOf Benchmark.options
@type Number
'maxTime': 5,
The minimum sample size required to perform statistical analysis.
@memberOf Benchmark.options
@type Number
'minSamples': 5,
The time needed to reduce the percent uncertainty of measurement to 1% (secs).
@memberOf Benchmark.options
@type Number
'minTime': 0,
The name of the benchmark.
@memberOf Benchmark.options
@type String|Null
'name': null
},
Platform object with properties describing things like browser name,
version, and operating system.
@static
@memberOf Benchmark
@type Object
'platform': req('platform') || window.platform || {
The platform description.
@memberOf Benchmark.platform
@type String
'description': window.navigator && navigator.userAgent || null,
The name of the browser layout engine.
@memberOf Benchmark.platform
@type String|Null
'layout': null,
The name of the product hosting the browser.
@memberOf Benchmark.platform
@type String|Null
'product': null,
The name of the browser/environment.
@memberOf Benchmark.platform
@type String|Null
'name': null,
The name of the product's manufacturer.
@memberOf Benchmark.platform
@type String|Null
'manufacturer': null,
The name of the operating system.
@memberOf Benchmark.platform
@type String|Null
'os': null,
The alpha/beta release indicator.
@memberOf Benchmark.platform
@type String|Null
'prerelease': null,
The browser/environment version.
@memberOf Benchmark.platform
@type String|Null
'version': null,
Return platform description when the platform object is coerced to a string.
@memberOf Benchmark.platform
@type Function
returns: {String} The platform description.
'toString': function() {
return this.description || '';
}
},
The version number.
@static
@memberOf Benchmark
@type String
'version': '0.3.0',
// clone objects
'deepClone': deepClone,
// iteration utility
'each': each,
// augment objects
'extend': extend,
// generic Array#filter
'filter': filter,
// generic Array#forEach
'forEach': forEach,
// generic own property iteration utility
'forOwn': forOwn,
// converts a number to a comma-separated string
'formatNumber': formatNumber,
// generic Object#hasOwnProperty
// (trigger hasKey's lazy define before assigning it to Benchmark)
'hasKey': (hasKey(Benchmark, ''), hasKey),
// generic Array#indexOf
'indexOf': indexOf,
// template utility
'interpolate': interpolate,
// invokes a method on each item in an array
'invoke': invoke,
// generic Array#join for arrays and objects
'join': join,
// generic Array#map
'map': map,
// retrieves a property value from each item in an array
'pluck': pluck,
// generic Array#reduce
'reduce': reduce
});
/*--------------------------------------------------------------------------*/
extend(Benchmark.prototype, {
The number of times a test was executed.
@memberOf Benchmark
@type Number
'count': 0,
The number of cycles performed while benchmarking.
@memberOf Benchmark
@type Number
'cycles': 0,
The number of executions per second.
@memberOf Benchmark
@type Number
'hz': 0,
The compiled test function.
@memberOf Benchmark
@type Function|String
'compiled': null,
The error object if the test failed.
@memberOf Benchmark
@type Object|Null
'error': null,
The test to benchmark.
@memberOf Benchmark
@type Function|String
'fn': null,
A flag to indicate if the benchmark is aborted.
@memberOf Benchmark
@type Boolean
'aborted': false,
A flag to indicate if the benchmark is running.
@memberOf Benchmark
@type Boolean
'running': false,
Alias of [`Benchmark#addListener`](#Benchmark:addListener).
@memberOf Benchmark, Benchmark.Suite
@type Function
'on': addListener,
Compiled into the test and executed immediately **before** the test loop.
@memberOf Benchmark
@type Function|String
@example
// basic usage
var bench = Benchmark({
'setup': function() {
var c = this.count,
element = document.getElementById('container');
while (c--) {
element.appendChild(document.createElement('div'));
}
},
'fn': function() {
element.removeChild(element.lastChild);
}
});
// compiles to something like:
var c = this.count,
element = document.getElementById('container');
while (c--) {
element.appendChild(document.createElement('div'));
}
var start = new Date;
while (count--) {
element.removeChild(element.lastChild);
}
var end = new Date - start;
// or using strings
var bench = Benchmark({
'setup': '\
var a = 0;\n\
(function() {\n\
(function() {\n\
(function() {',
'fn': 'a += 1;',
'teardown': '\
}())\n\
}())\n\
}())'
});
// compiles to something like:
var a = 0;
(function() {
(function() {
(function() {
var start = new Date;
while (count--) {
a += 1;
}
var end = new Date - start;
}())
}())
}())
'setup': noop,
Compiled into the test and executed immediately **after** the test loop.
@memberOf Benchmark
@type Function|String
'teardown': noop,
An object of stats including mean, margin or error, and standard deviation.
@memberOf Benchmark
@type Object
'stats': {
The margin of error.
@memberOf Benchmark#stats
@type Number
'moe': 0,
The relative margin of error (expressed as a percentage of the mean).
@memberOf Benchmark#stats
@type Number
'rme': 0,
The standard error of the mean.
@memberOf Benchmark#stats
@type Number
'sem': 0,
The sample standard deviation.
@memberOf Benchmark#stats
@type Number
'deviation': 0,
The sample arithmetic mean.
@memberOf Benchmark#stats
@type Number
'mean': 0,
The sample size.
@memberOf Benchmark#stats
@type Number
'size': 0,
The sample variance.
@memberOf Benchmark#stats
@type Number
'variance': 0
},
An object of timing data including cycle, elapsed, period, start, and stop.
@memberOf Benchmark
@type Object
'times': {
The time taken to complete the last cycle (secs).
@memberOf Benchmark#times
@type Number
'cycle': 0,
The time taken to complete the benchmark (secs).
@memberOf Benchmark#times
@type Number
'elapsed': 0,
The time taken to execute the test once (secs).
@memberOf Benchmark#times
@type Number
'period': 0,
A timestamp of when the benchmark started (ms).
@memberOf Benchmark#times
@type Number
'timeStamp': 0
},
// aborts benchmark (does not record times)
'abort': abort,
// registers a single listener
'addListener': addListener,
// creates a new benchmark using the same test and options
'clone': clone,
// compares benchmark's hertz with another
'compare': compare,
// executes listeners of a specified type
'emit': emit,
// removes all listeners of a specified type
'removeAllListeners': removeAllListeners,
// removes a single listener
'removeListener': removeListener,
// reset benchmark properties
'reset': reset,
// runs the benchmark
'run': run,
// pretty print benchmark info
'toString': toStringBench
});
/*--------------------------------------------------------------------------*/
The default options copied by suite instances.
@static
@memberOf Benchmark.Suite
@type Object
Suite.options = {
The name of the suite.
@memberOf Benchmark.Suite.options
@type String|Null
'name': null
};
/*--------------------------------------------------------------------------*/
extend(Suite.prototype, {
The number of benchmarks in the suite.
@memberOf Benchmark.Suite
@type Number
'length': 0,
A flag to indicate if the suite is aborted.
@memberOf Benchmark.Suite
@type Boolean
'aborted': false,
A flag to indicate if the suite is running.
@memberOf Benchmark.Suite
@type Boolean
'running': false,
An `Array#forEach` like method.
Callbacks may terminate the loop by explicitly returning `false`.
@memberOf Benchmark.Suite
parameter: {Function} callback The function called per iteration.
returns: {Object} The suite iterated over.
'forEach': methodize(forEach),
An `Array#indexOf` like method.
@memberOf Benchmark.Suite
parameter: {Mixed} value The value to search for.
returns: {Number} The index of the matched value or `-1`.
'indexOf': methodize(indexOf),
Invokes a method on all benchmarks in the suite.
@memberOf Benchmark.Suite
parameter: {String|Object} name The name of the method to invoke OR options object.
parameter: {Mixed} [arg1, arg2, ...] Arguments to invoke the method with.
returns: {Array} A new array of values returned from each method invoked.
'invoke': methodize(invoke),
Converts the array to a string.
@memberOf Benchmark.Suite
parameter: {String} [separator=','] A string to separate each element of the array.
returns: {String} The removed element.
'join': [].join,
An `Array#map` like method.
@memberOf Benchmark.Suite
parameter: {Function} callback The function called per iteration.
returns: {Array} A new array of values returned by the callback.
'map': methodize(map),
Retrieves the value of a specified property from all benchmarks in the suite.
@memberOf Benchmark.Suite
parameter: {String} property The property to pluck.
returns: {Array} A new array of property values.
'pluck': methodize(pluck),
Removes the last element of the host array and returns it.
@memberOf Benchmark.Suite
returns: {Mixed} The removed element.
'pop': [].pop,
Appends arguments to the end of the array.
@memberOf Benchmark.Suite
returns: {Number} The array length.
'push': [].push,
Sorts the elements of the host array.
@memberOf Benchmark.Suite
parameter: {Function} [compareFn=null] A function that defines the sort order.
returns: {Array} The sorted host array.
'sort': [].sort,
An `Array#reduce` like method.
@memberOf Benchmark.Suite
parameter: {Function} callback The function called per iteration.
parameter: {Mixed} accumulator Initial value of the accumulator.
returns: {Mixed} The accumulator.
'reduce': methodize(reduce),
// aborts all benchmarks in the suite
'abort': abortSuite,
// adds a benchmark to the suite
'add': add,
// registers a single listener
'addListener': addListener,
// creates a new suite with cloned benchmarks
'clone': cloneSuite,
// executes listeners of a specified type
'emit': emit,
// creates a new suite of filtered benchmarks
'filter': filterSuite,
// alias of addListener
'on': addListener,
// removes all listeners of a specified type
'removeAllListeners': removeAllListeners,
// removes a single listener
'removeListener': removeListener,
// resets all benchmarks in the suite
'reset': resetSuite,
// runs all benchmarks in the suite
'run': runSuite,
// array methods
'concat': concat,
'reverse': reverse,
'shift': shift,
'slice': slice,
'splice': splice,
'unshift': unshift
});
/*--------------------------------------------------------------------------*/
extend(Deferred.prototype, {
The deferred benchmark instance.
@memberOf Benchmark.Deferred
@type Object
'benchmark': null,
The number of deferred cycles performed while benchmarking.
@memberOf Benchmark.Deferred
@type Number
'cycles': 0,
The time taken to complete the deferred benchmark (secs).
@memberOf Benchmark.Deferred
@type Number
'elapsed': 0,
A timestamp of when the deferred benchmark started (ms).
@memberOf Benchmark.Deferred
@type Number
'timeStamp': 0,
// cycles/completes the deferred benchmark
'resolve': resolve
});
/*--------------------------------------------------------------------------*/
The event type.
@memberOf Benchmark.Event
@type String
Event.prototype.type = '';
/*--------------------------------------------------------------------------*/
// expose Deferred, Event and Suite
extend(Benchmark, {
'Deferred': Deferred,
'Event': Event,
'Suite': Suite
});
// expose Benchmark
if (freeExports) {
// in Node.js or RingoJS v0.8.0+
if (typeof module == 'object' && module && module.exports == freeExports) {
(module.exports = Benchmark).Benchmark = Benchmark;
}
// in Narwhal or RingoJS v0.7.0-
else {
freeExports.Benchmark = Benchmark;
}
}
// via curl.js or RequireJS
else if (freeDefine) {
define('benchmark', function() {
return Benchmark;
});
}
// in a browser or Rhino
else {
// use square bracket notation so Closure Compiler won't munge `Benchmark`
// http://code.google.com/closure/compiler/docs/api-tutorial3.html#export
window['Benchmark'] = Benchmark;
}
// trigger clock's lazy define early to avoid a security error
if (has.air) {
clock({ 'fn': noop, 'count': 1, 'options': {} });
}
}(this));
(C) Æliens
04/09/2009
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.