o = { "configGlossary:installationAt": "Philadelphia, PA", "configGlossary:adminEmail": "ksm@pobox.com", "configGlossary:poweredBy": "Cofax", "configGlossary:poweredByIcon": "/images/cofax.gif", "configGlossary:staticPath": "/content/static", "templateProcessorClass": "org.cofax.WysiwygTemplate", "templateLoaderClass": "org.cofax.FilesTemplateLoader", "templatePath": "templates", "templateOverridePath": "", "defaultListTemplate": "listTemplate.htm", "defaultFileTemplate": "articleTemplate.htm", "useJSP": false, "jspListTemplate": "listTemplate.jsp", "jspFileTemplate": "articleTemplate.jsp", "cachePackageTagsTrack": 200, "cachePackageTagsStore": 200, "cachePackageTagsRefresh": 60, "cacheTemplatesTrack": 100, "cacheTemplatesStore": 50, "cacheTemplatesRefresh": 15, "cachePagesTrack": 200, "cachePagesStore": 100, "cachePagesRefresh": 10, "cachePagesDirtyRead": 10, "searchEngineListTemplate": "forSearchEnginesList.htm", "searchEngineFileTemplate": "forSearchEngines.htm", "searchEngineRobotsDb": "WEB-INF/robots.db", "useDataStore": true, "dataStoreClass": "org.cofax.SqlDataStore", "redirectionClass": "org.cofax.SqlRedirection", "dataStoreName": "cofax", "dataStoreDriver": "com.microsoft.jdbc.sqlserver.SQLServerDriver", "dataStoreUrl": "jdbc:microsoft:sqlserver://LOCALHOST:1433;DatabaseName=goon", "dataStoreUser": "sa", "dataStorePassword": "dataStoreTestQuery", "dataStoreTestQuery": "SET NOCOUNT ON;select test='test';", "dataStoreLogFile": "/usr/local/tomcat/logs/datastore.log", "dataStoreInitConns": 10, "dataStoreMaxConns": 100, "dataStoreConnUsageLimit": 100, "dataStoreLogLevel": "debug", "maxUrlLength": 500};var s = '';for (var prop in o) { if (o.hasOwnProperty(prop)) { s += o[prop]; }}var s = '';for (var prop in o) { s += o[prop];}var s = '';Object.keys(o).forEach(function(prop) { s += o[prop];});--enable-precise-memory-info flag.
| Test case name | Result |
|---|---|
| for in hasown | |
| for in | |
| func |
| Test name | Executions per second |
|---|---|
| for in hasown | 35530.1 Ops/sec |
| for in | 65948.3 Ops/sec |
| func | 60073.1 Ops/sec |
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.
What is tested?
The provided JSON represents two individual test cases: for in, func, and for in hasown. These test cases aim to measure the performance of different ways to access properties of an object in JavaScript.
Options compared:
for...in loop: This loop iterates over all enumerable properties (including inherited ones) of an object.Object.keys() method with forEach() callback: This approach uses the Object.keys() method to get an array of property names and then loops through it using the forEach() method.Pros and Cons:
for...in loop:Object.keys() method with forEach() callback:Library used:
In the provided benchmark, there is no explicit library mentioned. However, it's worth noting that some of the libraries and classes used in the script preparation code, such as org.cofax.WysiwygTemplate and org.cofax.FilesTemplateLoader, are likely part of a larger application or framework.
Special JS features:
The benchmark does not use any special JavaScript features or syntax that would require additional explanation. The focus is on measuring the performance of the two main approaches to access object properties.
Other alternatives:
If you're looking for alternative ways to iterate over an object's properties, you could consider using:
for...of loop: This loop iterates over all own enumerable property names of an object.in operator with with statement: This approach uses the with statement to create a new scope for each iteration.Array.prototype.map() method: This approach converts the object's properties into an array and then maps over it.Keep in mind that each of these alternatives has its own trade-offs and may not be suitable for every situation.
I hope this explanation helps you understand what's being tested on MeasureThat.net!
