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This Week in JavaScript Performance

This Week in JavaScript Performance summarizes recent web postings related to JavaScript performance. Watch for it at the beginning of each week.

Put Your jQuery Scripts In The Fast Lane

Author: Joe Eames.   Publisher: pluralsight.This video shows how to fix jQuery performance problems using Firefox, Chrome, and IE’s profiling tools.

jQuery Fundamentals

Author: Klint Finley.   Publisher: ReadWriteWeb.If you know absolutely nothing about jQuery and would like to get a quick overview, this article provides a few sentences and a few relevant links to get you started in the right direction. Very short!

SCREENCAST TUTORIAL: JavaScript for() loop That Creates A jQuery Fade In/Fade Out

Author: not stated.   Publisher: Kaidez.This article and embedded videos present JavaScript source code and a tutorial for a fade-in / fade-out effect. It is a re-creation of the author’s previous fade-in / fade-out tutorial to make it dynamic and to add the three videos.

The Elements of a Clean Web Design

Author: Phil Zelnar.   Publisher: Six Revisions.Although this article does not relate directly to JavaScript nor performance, it impacts both. This well-respected article explains some of the basic concepts of “clean” web page design. Good peripheral (some would say essential) information for every JavaScript developer.

IE9 improves caching of re-directs but doesn’t (currently) play nicely with HTTP Watch

Author: not stated.   Publisher: Site Confidence.This article is an analysis of improper caching behaviour through HTTPWatch in IE9. HTTPWatch is not able to clear the cache and cookies. Analysis indicates that the cause of the problem is that IE9 now supports caching of HTTP redirect responses. Simtec is looking into the issue.

localStorage, perhaps not so harmful

Author: John Allsop.   Publisher: Web Directions.This article is a critique of localStorage opinions published by Christian Heilmann and Taras Glek, both from Mozilla. It includes measurements to support the author’s opinions, but does not measure the use of localStorage against other options. Chris Heilmann responds in a comment below the main article.

jsPerf JavaScript Performance Playground

Author: contributors.   Publisher: Mathias Bynens.Here are some of this week’s active JavaScript tests/measurements:

  • constructing a Date object with a string vs. with an integer
  • other alternatives to Math.floor
  • a comparison of 9 different ways to create a loop
  • string equality vs. regular expression
  • i++ vs. ++i
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About Warren Gaebel

Warren wrote his first computer program in 1970 (yes, it was Fortran).  He earned his Bachelor of Arts degree from the University of Waterloo and his Bachelor of Computer Science degree at the University of Windsor.  After a few years at IBM, he worked on a Master of Mathematics (Computer Science) degree at the University of Waterloo.  He decided to stay home to take care of his newborn son rather than complete that degree.  That decision cost him his career, but he would gladly make the same decision again. Warren is now retired, but he finds it hard to do nothing, so he writes web performance articles for the Monitor.Us blog.  Life is good!