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  Understanding JavaScript closure and where it can be used

Closure The official definition of closure is: an expression (usually a function) that has many variables and is bound to an environment that includes those variables. In JavaScript, closure refers to the ability of a function to access the lexical scope in which it was defined, even after the function has been executed and left that scope. This ability is due to the fact that when a function is created, it generates a closure that includes a reference to the definition environment of the curr...

   CLOSURE,JAVASCRIPT,USAGE     2023-03-05 02:17:08

  What is an HTC File?

Question: What is an HTC File?Did you find an HTC file on your computer and wonder what program should open it? Maybe someone emailed you an HTC file but you're not sure how to use it. Perhaps you tried to open the HTC file but Windows told you that it could not open it. Before you can open an HTC file (assuming it's even a file format that's intended to be viewed or edited), you'll need to determine what kind of file the HTC file extension refers to. Answer: A file with the HTC file exte...

   HTC,HTML Component,JavaScript,Extension     2011-06-30 23:07:44

  4 asynchronous programming methods in JavaScript

You may know the execution environment of JavaScript is single threaded. The so called single thread means only one task can be running at any time, if there are many tasks, they need to be in a queue and wait for the previous task to be completed. The advantage of this mode is it's easy to implement and the execution environment is relative simple; the disadvantage is that if one task takes long time, the tasks following it must wait in the queue and this will delay other tasks consequently. Th...

   JAVASCRIPT,ASYNCHRONOUS PROGRAMMING, EVENT MODEL,PROMISE     2012-12-25 00:55:47

  IDEs for Java programmers

IDEs are great helpers to programmers. They can help programmers write less error-prone programs with less time. They have become an inevitable part of many programmers. As a Java developer, you may be familiar with Eclipse already. But do you know other IDEs for Java programmers? We will give an overview of different IDEs for Java programmers. These IDEs are Eclipse, Intellij IDEA, NetBean and BlueJ. Eclipse Eclipse is the most widely used IDE for Java programmers. It's an open source IDE whic...

   Java IDE,BlueJ,NetBeans,Eclipse     2014-08-21 06:15:54

  PHP to output string to client terminal

It is a common task to echo messages to the user using PHP. There are lots of ways where the message can be echoed to the client terminal(browser or console window) through PHP. These includes some well know debug methods like var_dump() and var_export() etc. In this post, we will show you some other methods shared by Laruence, one of the core members of PHP development team. 1. echo First comes with the most common one : echo. $str = "Hello PHP\n"; echo $str; 2. print Then comes another c...

   TRICKS,DEBUG,OUTPUT,PHP     2015-10-01 03:16:56

  WireGuard VPN Troubleshooting

When you are working as a network/cluster admin for you team to config the WireGuard VPN for other members, you may meet some of the problems below and these are the solution you can try to fix them. ----------------------------------------------------------------------------------------------------------- Problem [1]: The WireGuard handshake request send from the client can be received from the server but the server's response was blocked at some where so the client can not receive serv...

   WIREGUARD,VPN,TROUBLESHOOTING     2021-12-14 09:17:46

  JavaScript to open link in new window without being popup blocked

To ensure security and reduce spamming, modern browsers have implemented very strict rules on when a new window can be opened in a web page. Currently browsers restrict that any new web page to be opened in a new window must be initiated with an user action. The action is usually an user click event. Otherwise, a popup blocker would show on the browser address bar which indicates that something is blocked. To workaround this issue, normally you should implement the window open logic in a click e...

   JAVASCRIPT,IFRAME,NEW WINDOW,OPEN LINK     2018-09-22 04:29:30

  Parallel Javascript

Lately the ideas for a parallel, shared memory JavaScript have begun to take shape. I’ve been discussing with various JavaScript luminaries and it seems like a design is starting to emerge. This post serves as a documentation of the basic ideas; I’m sure the details will change as we go along. User Model The model is that a JavaScript worker (the “parent”) may spawn a number of child tasks (the “children”). The parent is suspended while the children exe...

   Parallel JavaScript,API,Spawn,Parent,Task     2012-01-11 12:02:00

  Web Technologies Need an Owner

Many people seem to assume that the Web will one day become the one and only client computing platform on Earth, therefore it must not be controlled by anyone. This is a dangerous assumption. The HTML, CSS, and JavaScript triumvirate are just another platform, like Windows and Android and iOS, except that unlike those platforms, they do not have an owner to take responsibility for them.The Web has no one who can ensure that the platform acquires cutting edge capabilities in a timely manner (came...

   Web domain,Owner,Lead,Change,Innovation,     2011-09-28 09:12:12

  HTTP Streaming and Internet Explorer

In early 2006, Alex Russell posted about a neat hack that the Google Talk team in Gmail use to support Comet in Internet Explorer, a trick which works as far back as IE 5.01. What great news! A reliable way to stream Comet messages to Microsoft’s browsers. If only it were that easy. I have not been alone in the following findings: after connecting the htmlfile ActiveX object as a streaming Comet transport to my Comet server, everything works perfectly for a few messages, but then abruptly...

   IE,Streaming,JavaScript,htmlfile,ActiveX     2011-09-05 04:05:23