Created
March 16, 2010 09:26
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array performance
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| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" | |
| "http://www.w3.org/TR/html4/strict.dtd"> | |
| <html lang="en"> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> | |
| <title>Array Performance</title> | |
| <meta name="author" content="Martin Wittemann"> | |
| <meta name="author" content="Fabian Jakobs"> | |
| <!-- Date: 2010-03-09 --> | |
| <style type="text/css" media="screen"> | |
| table { | |
| border-collapse: collapse; | |
| border: 1px solid black; | |
| } | |
| td, th { | |
| border: 1px solid black; | |
| padding: 5px; | |
| } | |
| th { | |
| background: #DDD; | |
| } | |
| </style> | |
| <script src="logger.js" charset="utf-8"></script> | |
| <script src="measure.js" charset="utf-8"></script> | |
| </head> | |
| <body> | |
| <div id="logger"> | |
| </div> | |
| <script type="text/javascript" charset="utf-8"> | |
| var tests = { | |
| "array base line" : function() { | |
| var ar = []; | |
| for (var i = 0; i < 500000; i++) { | |
| ar[i] = i; | |
| }; | |
| }, | |
| "object base line" : function() { | |
| var map = {}; | |
| for (var i = 0; i < 500000; i++) { | |
| map[i] = i; | |
| }; | |
| }, | |
| "small sparse array" : function() { | |
| var ar = []; | |
| ar[10] = 10; | |
| for (var i = 0; i < 500000; i++) { | |
| ar[i] = i; | |
| }; | |
| }, | |
| "huge sparse array" : function() { | |
| var ar = []; | |
| ar[50000000] = 10; | |
| for (var i = 0; i < 500000; i++) { | |
| ar[i] = i; | |
| }; | |
| }, | |
| "array as object" : function() { | |
| var ar = []; | |
| ar.monkey = 10; | |
| for (var i = 0; i < 500000; i++) { | |
| ar[i] = i; | |
| }; | |
| }, | |
| "reverse array" : function() { | |
| var ar = []; | |
| for (var i = 500000; i>0; i--) { | |
| ar[i] = i; | |
| }; | |
| }, | |
| "reverse array with new Array(500000)" : function() { | |
| var ar = new Array(500000); | |
| for (var i = 500000; i>0; i--) { | |
| ar[i] = i; | |
| }; | |
| } | |
| }; | |
| var logger = new Logger(document.getElementById("logger")); | |
| var start = new Date(); | |
| measure(tests)(function(result) { | |
| logger.log(result.name, tests[result.name], result.times); | |
| }, function() { | |
| logger.log("DONE", "", [new Date() - start]); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| (function() { | |
| function median(values) { | |
| var values = values.sort(function(a, b) { | |
| return a>b ? 1 : -1; | |
| }); | |
| return values[Math.floor(values.length/2)]; | |
| } | |
| function mean(values) { | |
| var sum = 0; | |
| for (var i=0; i < values.length; i++) { | |
| sum += values[i]; | |
| }; | |
| return sum / values.length; | |
| } | |
| window.Logger = function(el) | |
| { | |
| this.table = document.createElement("table"); | |
| this.addRow("th", ["Name", "Code", "Times", "Median", "Mean"]); | |
| el.appendChild(this.table); | |
| } | |
| Logger.prototype = { | |
| addRow: function(type, data) { | |
| var row = document.createElement("tr"); | |
| for (var i=0; i<data.length; i++) | |
| { | |
| var td = document.createElement(i==0 ? "th" : type); | |
| td.innerHTML = data[i]; | |
| row.appendChild(td); | |
| } | |
| this.table.appendChild(row); | |
| }, | |
| log: function(name, code, times) | |
| { | |
| var times = times.sort(function(a, b) { | |
| return a>b ? 1 : -1; | |
| }); | |
| var data = [ | |
| name, | |
| "<pre>" + code + "</pre>", | |
| times.join(", "), | |
| median(times), | |
| mean(times) | |
| ]; | |
| this.addRow("td", data); | |
| } | |
| } | |
| })(); |
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| function measure(tests) { | |
| return function(onResult, onFinish) { | |
| var testFunctions = []; | |
| for (var name in tests) { | |
| testFunctions.push(asyncRepeated(asyncTest(tests[name], name), 5)); | |
| } | |
| runSerial(testFunctions)(function(results) { | |
| var result = {} | |
| result.name = results[0].name; | |
| result.times = []; | |
| for (var i=0; i<results.length; i++) { | |
| result.times.push(results[i].time); | |
| } | |
| onResult(result) | |
| }, onFinish); | |
| } | |
| } | |
| function asyncTest(call, name) { | |
| return runAsync(function() { | |
| var start = new Date(); | |
| call(); | |
| var time = new Date() - start; | |
| return {name: name, time: time}; | |
| }); | |
| } | |
| function runAsync(func) { | |
| return function(callback) { | |
| setTimeout(function() { | |
| callback(func()); | |
| }, 0); | |
| } | |
| } | |
| function asyncRepeated(call, count) { | |
| var results = []; | |
| var calls = []; | |
| return function(callback) { | |
| for (var i=0; i<count; i++) { | |
| calls.push(call); | |
| } | |
| runSerial(calls)(function(result) { | |
| results.push(result); | |
| }, function() { | |
| callback(results); | |
| }); | |
| } | |
| } | |
| function runSerial(asyncs) { | |
| return function(onResult, onFinish) { | |
| function runFirst() { | |
| if (!asyncs.length) { | |
| return onFinish(); | |
| } | |
| var call = asyncs.shift(); | |
| call(function(result) { | |
| onResult(result); | |
| runFirst(); | |
| }); | |
| } | |
| runFirst(); | |
| } | |
| } |
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Is it possible to run this tests in IE6 and IE7? Now it doesn't work.