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  Understanding the "this" keyword in JavaScript

Many people get tripped up by the this keyword in JavaScript. I think the confusion comes from people reasonably expecting this to work like “this” does in Java or the way people use “self” in Python. Although this is sometimes used to similar effect, it’s nothing like “this” in Java or other languages. And while it’s a little harder to understand, its behavior isn’t magic. In fact, this follows a relatively small set of simple rules. This...

   JavaScript,this,understanding     2012-03-29 13:48:59

  socket_create() from command prompt with WAMP

Problem:I’m working on a wamp system, and have started playing around with sockets. I enabled sockets via the wamp interface:wamp : PHP settings : PHP extensions : php_socketsand could run my php file via my browser.When trying to run the same file via the command prompt (start : run : cmd), I got the following error:Fatal error: Call to undefined function socket_create() in … on line …Solution:The command prompt uses a different php.ini file to the apache server.The Apac...

   PHP,WAMP,Windows,Command line,Socket     2011-05-30 10:59:14

  this in JavaScript in detail

this in JavaScript is always confusing, it is one of the most frequently seen traps in JavaScript. this is not a good design in JavaScript(You can refer some other design flaws of JavaScript here), since it's lazy binding feature, it can be a global object, the current object or.... Some people even avoid using this in JavaScript. Actually if you master how this works, then you will know how to stay away from these traps. Let's take a look at what this points to in below situations. 1. In global...

   JavaScript,this,bind     2013-05-09 18:35:12

  10 reasons why Dart is cooler than JavaScript

Dart is a new programming language from Google and after coding JavaScript for over one year now, I immediately felt in love with it. Coming from the Java world I had a good bunch of things I had to learn before I could use JavaScript. Some people say, you need to dig deep into JavaScript, otherwise you are not allowed to speak about the pros and cons of a language. I am not a JavaScript Ninja. But I strongly believe a programming language should be easy to learn, easy to understand and s...

   Dart,JavaScript,Comparison     2012-01-05 08:23:21

  A Javascript When Function

function when(conditionFunc, execFunc, interval){ if (conditionFunc()){ execFunc(); }else{ setTimeout(function(){ when(conditionFunc, execFunc, interval);}, interval); } } You have some code which should only execute when a condition is true. E.g. You have code which relies on a javascript library but can't be sure the library has loaded yet and don't want the code to execute until it has. This is common if you have a bookmarklet which injects more than one <...

   JavaScript,When,Implementation,When function     2012-02-24 05:08:34

  No support of $.browser in jQuery 1.9

Starting from jQuery 1.9, $.browser is no longer supported to detect the nrpwser type and version. The substitute is $.support. In the newer jQuery 2.x versions, IE 6/7/8 are also not supported. If users want to support IE 6/7/8, they must use jQuery 1.9. If you want to fully support IE and want to use jQuery 1.9 and jQuery 2.0, the official solution is: <!--[if lt IE 9]> <script src='jquery-1.9.0.js'></script> <![endif]--> <!--[if gte IE 9]> <script src=...

   jQuery,$.browser,$.browser.version     2013-08-27 03:10:12

  Will nil == nil be true in GoLang

There is some interview question may ask whether nil == nil be true in GoLang. Wil it be true. false or compilation error? To know the answer, some knowledge about nil in GoLang needs to be explained first. nil definition According to Go's official documentation, the definition of nil is // nil is a predeclared identifier representing the zero value for a // pointer, channel, func, interface, map, or slice type. var nil Type // Type must be a pointer, channel, func, interface, map, or slice type...

   GOLANG,NIL,NIL EXPLANATION     2021-08-08 02:54:15

  Ensure triggering transitionend event in JavaScript

CSS3 Transition has been widely used in modern web app development to offer users animations. Traditionally animations of element in HTML are controlled by JavaScript. If fancy animation is desired, then third party plugins can be installed in browsers such as Flash, Silverlight, Java Applet etc. With CSS3, animations can be easily achieved like a charm. Transition is one of the many features provided by CSS3. It can be used to transit one element from one state to another state smoothly within ...

   CSS3 TRANSITION, TRANSITIONEND, FORCE FIRE TRANSITIONEND     2015-05-09 08:56:51

  Why using anchors as buttons sucks

So let's say you're an awesome web developer making an awesome web app. One day, you add a link in the web app that has an event handler instead of an href. Testing it, you realize that your cursor doesn't change when hovering over it, unlike a normal link. You think for a minute and then give it a cursor:pointer style, which fixes the issue. You are happy.The next day, QA informs you that the link cannot be tabbed to. Confused, you do some research and find a solution to the problem: Sim...

   Anchor,Button,Link,Sucks     2012-02-05 07:22:39

  Integer overflow

You may be familiar with integer overflow, but what you may not be familiar with is how gcc handles signed integer overflow. First let's look at the standard, for unsigned integer, the standard says : A computation involving unsigned operands can never overflow, because a result that cannot be represented by the resulting unsigned integer type is reduced modulo the number that is one greater than the largest value that can be represented by the resulting type. In other words, unsigned integer ov...

   Integer overflow,gcc,Linux     2012-10-20 13:33:10

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