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  Hash Tables in Javascript

IntroductionHash tables are a permutation of associative arrays (i.e. name => value pairs). If you use PHP, then you are very familiar with this type of data structure already since all PHP arrays are associative.The Javascript language implements very loose and somewhat limited support for associative arrays. Any JavaScript array can use other objects as keys, making it a hash, but there exists no formal constructor for initializing them and it is more or less unweildy to work with. A short ...

   JavaScript,Hashtable,Implementation,Array     2011-11-26 02:43:40

  A plugin to update last_error in Delayed Job

delayed_job is a process based asynchronous task processing gem which can be ran at background. It will fork the specified number of processes to execute the tasks asynchronously. The task status is usually stored in the database so that it can be easily integrated into a Rails application where asynchronous job execution is desired. Normally when a job fails to execute or error occurs, it would save the error into the database with the column last_error. Ideally all these will be handled b...

   RUBY,RUBY ON RAILS,DELAYED JOB,LAST_ERROR     2017-11-18 13:05:49

  From College To Silicon Valley: Tips From A Veteran

Editor’s note: Pedram Keyani has been an engineer at Facebook since 2007. He is a manager on the Site Integrity team, the inventor of Keg Presence and a Hackathon enthusiast. Looking for internships and jobs after college can be exhilarating, especially for people with engineering and other technical expertise. In an otherwise tough job market, demand for software engineers is higher than ever right now. You may find that companies are actually competing to pay you for the knowledge y...

   Career,College,Silicon valley,Transition,Experience     2012-02-20 05:34:24

  PHP Security

1. IntroductionWriting PHP applications is pretty easy. Most people grasp the syntax rather quickly and will within short time be able to produce a script that works using tutorials, references, books, and help forum forums like the one we have here at PHP Freaks. The problem is that most people forget one of the most important aspects that one must consider when writing PHP applications. Many beginners forget the security aspect of PHP. Generally, your users are nice people, they will...

   PHP,Security,SQL Injection,XSS Cross sit     2011-10-01 02:25:31

  Is Ubuntu becoming a big name in enterprise Linux servers?

Summary: Mark Shuttleworth says yes, Ubuntu is now competitive with Red Hat Enterprise Linux in the enterprise space. Since last summer, Ubuntu has been more popular than Red Hat as a Web server. When you think of Ubuntu Linux, what do you think of? I would guess you think about the Linux desktop. While Ubuntu is certainly a big player—maybe the biggest—when it comes to the Linux desktop, Mark Shuttleworth, founder of Canonical, the c...

   Linux,Ubuntu,Daat center,Server     2012-04-15 01:22:53

  Some Thoughts on Twitter's Availability Problems

As a regular user of Twitter I've felt the waves of frustration wash over me these past couple of weeks as the service has been hit by one outage after another. This led me to start pondering the problem space [especially as it relates to what I'm currently working on at work] and deduce that the service must have some serious architectural flaws which have nothing to do with the reason usually thrown about by non-technical pundits (i.e. Ruby on Rails is to blame). Some of my suspicions ...

   Twitter,Architecture,Availability,Design     2011-08-12 07:39:21

  10 things you gotta have to succeed in IT

Takeaway: Everyone seems to agree that IT is a tough field. But what does it take to overcome the adversities and become a successful IT pro? These qualities may be the key. I recently wrote a string of articles discussing various reasons to leave IT — and various alternative careers for dissatisfied IT workers. I received an amazing amount of feedback from readers who have always wanted to express similar sentiments. But that leaves out a huge swath of peo...

   Tips,IT,Development     2011-07-21 21:55:13

  There are no free lunches on the internet

Hot data: An IT technician checks the network servers at a data farm. Alamy Photograph: Juice Images/AlamyPhysics has Newton's first law ("Every body persists in its state of being at rest or of moving uniformly straight forward, except insofar as it is compelled to change its state by force impressed"). The equivalent forinternet services is simpler, though just as general in its applicability: it says that there is no such thing as a free lunch.The strange thing is that most use...

   Free lunch,Facebook,Google,Privacy information     2011-11-21 03:03:31

  Building the new AJAX mail UI part 2: Better than templates, building highly dynamic web pages

This is part 2 of a series of technical posts documenting some of the interesting work and technologies we’ve used to power the new interface (see also part 1, Instant notifications of new emails via eventsource/server-sent events). Regular users can skip these posts, but we hope technical users find them interesting. As dynamic websites constructed entirely on the client side become de rigueur, there are a number of templating languages battling it out to become the One True Wayâ„...

   Web design,Dynamic,Ajax,UI     2012-02-21 05:32:29

  Unfortunate Python

Python is a wonderful language, but some parts should really have bright WARNING signs all over them. There are features that just can't be used safely and others are that are useful but people tend to use in the wrong ways. This is a rough transcript of the talk I gave at my local Python group on November 15, with some of the audience feed back mixed in. Most of this came from hanging around the Python IRC channel, something I highly recommend. [update 2011-12-19: improved "array" cr...

   Python,Defects,Deprecated methods,Warning     2011-12-20 08:27:36

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